PubMed Health⌕ Search

Biomedical subjects

B Seitz

Publications and source records attributed to B Seitz.

At least 19 recordsLinked to original sources
PubMed2006

Measurement of the Gerasimov-Drell-Hearn Integrand for 2H from 200 to 800 MeV.

A measurement of the helicity dependence of the total inclusive photoabsorption cross section on the deuteron was carried out at MAMI (Mainz) in the energy range 200<Egamma<800 MeV. The experiment used a 4pi detection system, a circularly polarized tagged photon beam and a frozen-spin target which provided longitudinally polarized deuterons. The contribution to the Gerasimov-Drell-Hearn sum rule for the deuteron determined from the data is 407+/-20(stat)+/-24(syst) mu b for 200<Egamma<800 MeV.

Journal Article↗
PubMed2006

[Evaluation of dynamic contour tonometry in penetrating keratoplasties].

PURPOSE: The PASCAL dynamic contour tonometer (DCT) adapted to the corneal geometry is a new approach for digital measurement of intraocular pressure (IOP). The purpose of this study was to evaluate the DCT vs Goldmann applanation tonometry (GAT) in penetrating keratoplasties. METHOD: We included 92 consecutive eyes after penetrating keratoplasty (57 without sutures, 32 with 2 running sutures, 3 with 1 running suture) in this prospective cross-sectional study. The mean outcome measurements were central corneal power (Zeiss ophthalmometer) and central corneal thickness (ultrasound pachymetry Tomey AL-1000). IOP was evaluated in consecutive measurements including 3x DCT and 1x GAT. RESULTS: The mean IOP measured with DCT was 18.3+/-4.0 mmHg in contrast to GAT with 14.3+/-4.1 mmHg (p<0.001). Both methods showed a strong correlation of IOP values (r=0.74, p<0.001). The quality of measurement in keratoplasties after complete suture removal was between Q1 and Q3 in 88% with DCT in contrast to 59% with two running sutures. Three values with a reproducibility of 0.97 (Cronbach's alpha) could be obtained in 53 eyes without sutures and with a reproducibility of 0.94 (Cronbach's alpha) in 20 eyes (62.5%) with 2 running sutures. DCT or GAT did not correlate with central corneal thickness. The mean astigmatism did not differ between keratoplasties without sutures (4.86+/-3.35 D) or with two running sutures (4.2+/-2.8 D, p=0.38). CONCLUSIONS: The DCT provides reproducible IOP measurements in penetrating keratoplasties with significantly higher values in comparison to GAT. Nevertheless, as known for GAT, postoperative intrastromal corneal sutures after penetrating keratoplasty disturb the exact DCT measurement as well.

Equipment Design↗
PubMed2006

[Accommodation ability under the aspect of refractive, demographic, and biometric parameters].

PURPOSE: The aim of this study was to evaluate the accommodation ability in healthy phakic eyes in relation to refraction and biometric parameters in order to get comparable results for patients with the accommodative 1 CU posterior chamber lens. METHODS: The study included 120 normal eyes of 120 patients (77 males, 43 females, mean age: 40+/-18, range: 11-70 years). The inclusion criteria were spherical equivalent for distance refraction <2 D, astigmatism <1.5 D, and a best-corrected visual acuity > or =0.8. Exclusion criteria were diabetes, glaucoma, cataract, traumas, or previous surgery. Subjects were divided into six age groups at increments of 10 years. Each group consisted of 20 subjects. Measurements included subjective and objective refraction (D), the accommodation ability (D) assessed with an accommodometer, and biometric parameters using the IOLMaster. In addition, the relation of anterior chamber depth and length of the eye was calculated for analyzing the relationship of anterior eye segment and accommodation. RESULTS: The spherical equivalent for distance refraction was 0.04+/-0.6 D with a range of -1.5 to 2.0 D. There was no sex-related significant difference of accommodation range. The accommodation range (D) decreased significantly with increasing age (p<0.0001, r=-0.895). The highest decrease could be found between the ages of 30 and 50 years. In subsequent years, the decline in accommodation ability was comparatively less. In association with the anterior chamber depth and the relation of anterior chamber depth and length of the eye, the accommodation ability fell with increasing age (p<0.001). The length of the eye did not correlate with the accommodation ability (p=0.8). CONCLUSION: There is a strong relationship between accommodation ability and age. Accommodation ability decreases strongly from the 3rd to the 5th decade; after that the loss of accommodation ability is relatively lower. The increase in lens thickness during the life span can implicate a correlation between the change of anterior chamber depth in relation to the length of the eye and a decrease of accommodation ability. Our results confirm Duane's hypothesis of accommodation and age.

Accommodation, Ocular↗
PubMed2006

[Impact of the eye's cyclorotation on axial orientation analysis of toric intraocular lenses: recommendations for an optimized evaluation of rotational stability of toric IOLs].

BACKGROUND: After the implantation of toric intraocular lenses (tIOLs) significant postoperative tIOL rotation angles were measured occasionally. We investigated the rotational stability of eyes during standardized photography and recommend two methods for an enhanced evaluation of tIOL rotation. PATIENTS AND METHODS: 1. The cyclorotation of the eye was investigated using standard fundus photography. A sequence of two fundus photographic slides was taken in 550 phakic eyes of 275 consecutive patients with a time interval of at least 6 months. With characteristic markers on the fundus photograph, the axial orientation of the eyes was defined and the cyclorotation between the two slides of each eye was measured. 2. Using bifocal photography (HRA II - Heidelberg Retina Angiograph), a sequence of anterior segment and fundus images was taken considering stable head position in 19 pairs of photographs of eyes with implanted tIOLs. The angle between reference fundus axis and tIOL axis was measured at both time stages (mean: after 3 months). The difference of the angle between bifocal-image samples was defined as the real tIOL rotation angle. 3. Ten pairs of anterior segment photographs of eyes with a tIOL were investigated using the Axenfeld loop analysis. In each photograph, the angle between the axis connecting two Axenfeld loops and the tIOL axis was measured. The difference of two angles of two photographs was defined as the rotational tIOL angle. RESULTS: 1. The mean absolute eye's rotation angle was 2.3 +/- 1.7 degrees (range: 0 to 11.5 degrees) in all 550 eyes. Only 9.1 % of the eyes did not rotate. In 57.3 % of the eyes a rotation of less than 3 degrees and in 33.6 % of more than or equal to 3 degrees was detected. The eye's cyclorotation correlated (p < 0.04) with an age older than 39 years and higher astigmatism (> 1.5 D). Because of the significant amount of spontaneous globe rotation we developed the following enhanced methods to minimize measurement errors of tIOL rotation: 2. Bifocal photography: comparing the 19 HRA anterior segment images, the amount of mean tIOL rotation was 5.4 +/- 4.8 degrees (range: 0 - 20.0 degrees). Using the bifocal photography, the mean tIOL rotation was 1.9 +/- 1.3 degrees (range: 0 - 5.0 degrees). The overestimated rotation of the tIOL (only anterior segment tIOL comparison) correlated with higher amounts of the eye's cyclorotation (r = 0.94; p = 0.01) and higher corneal astigmatism (r = 0.54; p = 0.05). 3. The simultaneous analysis of Axenfeld loops revealed significantly smaller amounts of tIOL rotation (2.3 +/- 2.5 degrees range: 0 - 7.0 degrees ) in 10 pairs of anterior segment photographs in contrast to the single analysis of tIOL axis (5.5 +/- 4.8 degrees range: 1 - 13.0 degrees p = 0.09). A reduction of up to 18.0 degrees tIOL rotation measurement failure was possible in single cases by applying the bifocal photography or simultaneous Axenfeld loop analysis. CONCLUSIONS: Head inclination, head rotation, and incyclo- or excyclorotation of the eye may have a significant impact on the tIOL axis evaluation. Besides the bifocal photography the simultaneous Axenfeld loop analysis could be a promising alternative to the conventional axis evaluation of tIOLs.

Artifacts↗
PubMed2005

[Toric intraocular lenses for correction of persistent corneal astigmatism after penetrating keratoplasty].

PURPOSE: Cataract extraction with implantation of toric intraocular lenses (tIOL) is a new surgical option for correction of residual astigmatism following penetrating keratoplasty and cataract with only minimal direct manipulation of the graft. PATIENTS AND METHODS: We implanted an individually manufactured backtoric tIOL in 11 eyes of 9 patients. TIOL power calculation was done using vergence transformation in a paraxial space. RESULTS: Implantation and intraoperative alignment of tIOL were uneventful in all patients. Uncorrected visual acuity increased from 0.1+/-0.06 preoperatively to 0.47+/-0.18 (p=0.006) postoperatively. Best-corrected visual acuity changed from 0.23+/-0.18 preoperatively to 0.6+/-0.14 postoperatively (p=0.002). The refractive cylinder could be reduced from 7.0+/-2.6 D to 1.63+/-1.5 D (p=0.001) after surgery. We observed a small mean deviation from the target axis of 4.1+/-2.9 degrees (0-8 degrees ) after a mean follow-up time of 3.5 (2-7) months. CONCLUSION: TIOL implantation is a promising option for correction of high astigmatism following penetrating keratoplasty with only minimal direct surgical manipulation of the graft. Regular and symmetric corneal topography is essential for successful implantation of tIOL.

Aged↗
PubMed2005

[Neurotrophic keratitis].

Neurotrophic keratitis is a degenerative disease of the cornea caused by reduced corneal innervation. Trauma, tumors, inflammatory lesions and surgical procedures can damage the first branch of the trigeminal nerve on its entire course from brainstem to and within the cornea. Loss or reduction of corneal innervation leads to a reduced aqueous phase of the tear film and due to reduced supply with neurotransmitters/trophic factors also to reduced epithelial healing capacity (impaired mitosis and migration). Combined existence of tear film deficiency and impaired epithelial healing capacity predispose to persistent epithelial defects, corneal ulcers and perforation. Early diagnosis and adequate treatment may prevent this catastrophic chain of events.

Cell Movement↗
PubMed2005

[Conservative and surgical treatment of neurotrophic keratopathy].

Neurotrophic keratopathy is one of the most challenging conditions among the disorders of wound healing of the ocular surface. In addition to bilateral assessment of corneal sensitivity, tear status and lid function must be analyzed and treated by unpreserved artificial tears and adequate lid surgery. Further conservative treatment options include hyaluronic acid and dexpanthenol as well as autologous serum. Application of recombinant growth factors (especially NGF) represents an interesting perspective. Concerning surgical interventions, temporary or permanent occlusion of the lacrimal punctum may be accompanied by lateral tarsorrhaphy which is easy to perform, potentially reversible, and in most cases successful. Depending on the type of wound healing disorder amniotic membrane transplantation may be helpful either as basal membrane transplant (graft) or as a patch, or in combination (sandwich). A tectonic keratoplasty a chaud should typically be combined with a simultaneous amniotic membrane patch and/or a lateral tarsorrhaphy to avoid persistent epithelial defects.

Adjuvants, Immunologic↗
PubMed2005

[The penetrating keratoplasty. A 100-year success story].

Ten precautions for prophylaxis of astigmatism in penetrating keratoplasty are recommended:1. The attempt should be made to determine donor topography for exclusion of previous refractive surgery, keratoconus/high astigmatism, and to allow for "harmonization" of donor and recipient topography.2. Donor and recipient trephination should be performed from the epithelial side with the same system, which is the prerequisite for congruent cut surfaces and angles in donor and recipient. For this purpose an artificial anterior chamber is used for donor trephination.3. Orientation structures in donor and host facilitate the correct placement of the first four or eight cardinal sutures to avoid horizontal torsion.4.A measurable improvement seems to be possible, using the Krumeich guided trephine system (GTS), the second generation Hanna trephine, and the Erlangen technique of nonmechanical trephination with the excimer laser.5. Horizontal positioning of the head and limbal plane are indispensable for state-of-the-art PKP surgery in order to avoid decentration, vertical tilt, and horizontal torsion.6. Graft size should be adjusted individually ("as large as possible, as small as necessary").7. Limbal centration should be preferred over pupil centration (especially in keratoconus).8. Excessive graft over- or undersize should be avoided to prevent stretching or compression of peripheral donor tissue.9. As long as Bowman's layer is intact a double running cross-stitch suture (according to Hoffmann) is preferred since it results in higher topographic regularity, earlier visual rehabilitation, and less suture loosening requiring only rarely suture replacement.10.Intraoperative keratoscopy should be applied after removal of lid specula and fixation sutures.

Astigmatism↗
PubMed2005

[Keratoplasty -- a simple classification/terminology of current treatment options].

Thanks to technical advances the surgical options for corneal grafting have been widely expanded in recent years. Promoted by new instruments and techniques for intrastromal dissection a number of variations of lamellar keratoplasty, including descriptive terms and abbreviations have been suggested. This creative chaos, however, lacks simplicity, specificity and structure. Following a short definition of the basic terms we here present a simplified and clearly structured classification, which also incorporates the Anglo-American terminology and should, therefore, be acceptable for the wider international ophthalmic community.

Corneal Transplantation↗
PubMed2004

Accommodation after Nd: YAG capsulotomy in patients with accommodative posterior chamber lens 1CU.

PURPOSE: After initial encouraging results with the accommodative 1CU posterior chamber lens (PCIOL), we investigated the rate, the postoperative time point of posterior capsular opacification (PCO) necessitating YAG capsulotomy and the accommodative range after Nd: YAG capsulotomy in patients with 1CU-PCIOL. PATIENTS AND METHODS: This prospective clinical study included 65 patients who underwent phacoemulsification and implantation of the accommodative 1CU-PCIOL with postoperative follow-up from 3 to 24 months. Postoperative examination was performed 3, 6 and 12 months after surgery, then before and 6 weeks after Nd: YAG capsulotomy. Measurements included: the best corrected distance visual acuity, distance refraction, near visual acuity (Birkhauser charts in 35 cm) obtained with best distance correction, accommodative range measured by subjective near point with an accodommometer and defocusing with a visual acuity fall to 0.4. RESULTS: Both best corrected distance visual acuity (1.1+/-0.1) and near visual acuity with best distance correction (0.4+/-0.1) remained stable over the follow-up period until 12 months postoperatively. The accommodative range determined by near point was stable (mean 2.0+/-0.5 D). Also, the defocusing range remained stable over 12 months (1.8+/-0.4 D). A clinically relevant posterior capsule opacification with a significant decrease of visual acuity (0.4+/-0.2) and a need for Nd: YAG capsulotomy was diagnosed in 12 patients between 15 and 22 (mean 20+/-4, median 20) months postoperatively. All capsulotomies were performed without complication. Six weeks after capsulotomy, best corrected distance visual acuity was improved (1.1+/-0.1), near visual acuity with best distance correction was 0.4+/-0.1 and the accommodative range determined by near point was 1.95+/-0.6 D and by defocusing was 1.88+/-0.47 D. Six weeks after capsulotomy, measurements of the accommodative range did not show any statistical difference to the 12-month results before the occurrence of PCO (P>0.5). CONCLUSIONS: A clinically relevant PCO with a significant decrease of visual acuity necessitating Nd: YAG capsulotomy occurred mainly after 15 postoperative months in patients with 1CU. Our results indicate that Nd: YAG capsulotomy may not affect the accommodation ability of the 1CU. Nevertheless, long-term studies are needed to further analyze the accommodative properties.

Accommodation, Ocular↗
PubMed2004

[Phototherapeutic keratectomy (o-PTK) with 193 nm excimer laser for superficial corneal scars. Prospective long-term results of 31 consecutive operations].

PURPOSE: To investigate the functional and morphological long-term outcome of phototherapeutic keratectomy (PTK) for superficial corneal scars of varying origin. PATIENTS AND METHODS: Between 1989 and 11/2002, 317 PTKs were performed in Erlangen, of which 31 consecutive procedures were assessed in this prospective study. The intended laser ablation depth after epithelial debridement and pannectomy varied from 12 to 150 microm. We used the slit-scanning-mode (Carl Zeiss Meditec AG) with a repetition rate of 20/s or 25/s, a pulse energy of 14.5 mJ (median) and a pulse rate of 2565+/-2036 (222-6962). In most cases a 6.0 mm metal mask was used to protect peripheral Bowman's layer. RESULTS: After a mean follow-up of 2.0+/-1.9 (maximum 6.9) years, best-corrected visual acuity increased from preoperatively 0.3+/-0.2 to 0.5+/-0.3 (increase 87%, no change 10%, decrease 3%). Corneal surface topography regularized significantly (p=0.02). The spherical equivalent increased only slightly from -0.4+/-2.5 D preoperatively to 0.2+/-2.9 D postoperatively. Likewise, mean keratometric central power did not change significantly. In 10 eyes the maximum postoperative haze was mild, in 4 eyes moderate, and there was only one recurrent scar after delayed epithelial healing following epidemic keratoconjunctivitis. CONCLUSIONS: In superficial corneal scars of varying origin an o-PTK using the 193 nm excimer laser can moderately increase visual acuity in most cases. Therefore, a lamellar or penetrating keratoplasty might be avoided.

Adult↗
PubMed2004

[Results of the first 1,000 consecutive elective nonmechanical keratoplasties using the excimer laser. A prospective study over more than 12 years].

BACKGROUND AND PURPOSE: The purpose of this prospective clinical cross-sectional study was to analyse indications, intraoperative, perioperative and postoperative pecularities and complications as well as postoperative functional and morphologic results of the first 1000 consecutive elective round laser keratoplasties. PATIENTS AND METHODS: The age of the 480 females and 520 males (362 x keratoconus), who had been operated on between 07/1989 and 04/2002 ranged from 20 to 92 years (mean 55+/-19). A total of 6 microsurgeons performed 718 x PK only, 222 x a triple procedure and 60 x additional IOL manoeuvres. Recipient and donor trephinations were accomplished with an 193 nm excimer laser (Carl Zeiss Meditec, Jena, Germany) from the epithelial side. RESULTS: In 895 eyes with perioperative corneal erosion, epithelial healing took not more than 3 days in half of cases. During a follow-up period of 1.9+/-1.5 years, in 35 eyes episodes of acute diffuse (8 irreversible) and in 12 eyes episodes of chronic focal (5 irreversible) endothelial immunologic graft reactions (4.7%) occurred between 6 weeks and 4.7 years after PK. Before/after suture removal, median values of astigmatism were 1.5 diopters (D)/2.5 D refractive, 3.0 D/3.3 D keratometric, and 4.0 D/4.2 D topographic. Best-corrected visual acuity was 0.50/0.60, respectively. CONCLUSIONS: More than 12 years of experience with this new technique indicate that besides optical advantages, nonmechanical trephination does not cause intraoperative or postoperative disadvantages for the patient. Under standardised surgical conditions a massive increase of astigmatism after suture removal seems to be avoidable with laser trephination in most cases due to reduction of decentration,"vertical tilt" and especially "horizontal torsion".

Adult↗
PubMed2004

[Sterility of non-preserved autologous serum drops for treatment of persistent corneal epithelial defects].

PURPOSE: To investigate the sterility of non-preserved autologous serum drops in hospitalized patients with persistent corneal epithelial defects. METHODS: Thirty patients with persistent corneal epithelial defects (aged between 28 and 85, mean 67+/-14 years) were treated with autologous serum drops in five different wards of a university eye hospital between October 2001 and March 2002. After centrifugation of freshly collected autologous blood, the serum was stored in sterile drop bottles at refrigerator temperature (7 degrees C) and applied undiluted every 1 or 2 h up to 7 days. Using blood, chocolate, endo, and Sabouraud agar media, we assessed the sterility of autologous serum drops on the day before application and on the 4th and 7th days. Examinations performed on the 1st and 4th days included 40 autologous serum drops each and on the 7th day 120 samples (40 serum drops, 40 bottle tops, and 40 bottle bottoms). The agar media for bacterial examination were read after 48 h of incubation time, and those for fungal examination were read after 21 days. All patients had received topical autologous serum therapy and prophylactic antibiotic drops for at least 7 days. RESULTS: The time period of autologous serum treatment ranged from 7 to 28 (10+/-5) days. On the 1st and 4th days autologous serum drops were sterile. On the 7th day, 3 of 40 (7.5%) samples were contaminated with Staphylococcus epidermidis. Two of these contaminations were due to a combined serum drop and bottle top contamination (5%). A third case resulted from additional bottle bottom contamination (2.5%). None of the samples examined showed signs of fungal infection. During application of autologous serum as well as during the follow-up period no patient showed any symptoms of ocular infection. CONCLUSIONS: The application of autologous serum has proven to be a practicable therapy in patients with persistent corneal epithelial defects. When the drops are applied by trained personnel, the absence of contamination can be ensured up to the 4th day. By additional application of prophylactic antibiotic drops, infections may be avoided even if refrigerated non-preserved autologous serum is used up to 7 days.

Adult↗
PubMed2004

[Toric intraocular lenses for compensation of corneal astigmatism].

BACKGROUND: Besides arcuate or straight transverse keratotomies, toric intraocular lenses are of increasing popularity to enhance the visual function in cases of lens opacification for the correction of corneal astigmatism and the following ocular surgery such as penetrating keratoplasty. The purpose of this study was to present a generalized scheme for the calculation of toric intraocular lenses and to demonstrate its potential on a clinical example in a step-by-step approach. METHODS: After providing some helpful approximations for the clinicians, i. e., for a conversion of radii differences to corneal astigmatism, the calculation scheme using vergence transformation in a paraxial space and the dualism of the standard and component notation for the description of spherocylindrical vergences and spherocylindrical refractive surfaces is described. RESULTS: In a clinical example, a toric intraocular lens is calculated step-by-step using the above-mentioned calculation scheme. The methodology is designed in a matrix structure for the direct implementation in a computer language. In a second step, a toric lens similar to the calculated lens in the manufacturing grid is selected and inserted with a small angle of rotation from the ideal implantation axis to demonstrate the effect on postoperative refraction. CONCLUSIONS: The calculation scheme allows the determination of toric intraocular lenses with an astigmatic cornea and enables us to achieve a spherocylindrical target refraction with cylinder axis at random. Furthermore, the postoperative refraction at the spectacle or corneal plane can be simulated by inserting any toric intraocular lens oriented in any axis. The concept can be easily generalized to 'thick' toric intraocular lenses if the geometrical data and the refraction index of the material are known.

Astigmatism↗
PubMed2004

[Clinical aspects and treatment of immune reactions following penetrating normal-risk keratoplasty].

PURPOSE: Endothelial graft rejection is one of the most common causes of graft failure following penetrating keratoplasty (PK). The aim of this study was to evaluate the incidence, time course and outcome of treatment of graft rejection after normal-risk PK and to identify possible risk factors for the recurrence of immune reactions and irreversible graft failure. PATIENTS AND METHODS: The study included 500 eyes from the prospective Erlanger Normal-risk Keratoplasty Study with a mean follow-up of 42 +/- 18 (median 40) months. Indications for PK were keratoconus in 48 %, Fuchs' dystrophy in 30 %, secondary bullous keratopathy in 11 %, non-vascularized corneal scars in 7 % and stromal dystrophies in 4 %. Standardized complete ophthalmological examinations were performed on a regular basis before, during the acute graft rejection and then regularly in a defined examination raster in an cornea out-patient service. RESULTS: During follow-up 29 eyes (5.6 %) developed an episode of endothelial graft rejection (23 eyes with acute diffuse and 6 eyes with chronic focal rejection type). Episodes of endothelial graft rejection clustered between 11 and 25 months postoperatively (15 from 29, 51.7 %). Most grafts (25 of 29) regained clarity after topical and systemic steroid treatment. Only 4 patients showed an irreversible graft failure requiring a repeat PK, all of whom had secondary bullous keratopathy as the primary indication for PK. Risk factors for irreversible graft failure were pre-existing anterior synechiae in 3 patients and secondary open angle glaucoma in pseudoexfoliation syndrome in one patient. Recurrence of graft rejection was seen in 5 patients (all with keratoconus) after a time interval of 8 to 12 months. Under very low topical steroid treatment no further recurrence was observed in all 5 patients up to 2 years. CONCLUSION: Patients should be followed-up on a regular base for longer postoperative periods, since most episodes of graft rejection were observed between 1 and 2 years after PK. Development of irreversible graft failure was strongly associated with pre-existing anterior synechiae and pre-existing glaucoma. Low-dose topical steroid treatment after immunological rejection seems to prevent the recurrence of further graft rejection.

Adult↗
PubMed2004

[Bifocal photography using the HRA -- an optimized method to evaluate tIOL's axial orientation].

BACKGROUND: The assessment of axial orientation of toric IOLs (tIOLs) by monofocal photography can be deteriorated due to intrinsic errors e. g. globe rotation, head inclination or inadequate camera adaption and slide projection. METHOD: In a 67 years old female a tIOL was implanted after penetrating keratoplasty for correction of high corneal astigmatism. A sequence of two fundus and two tIOL photographs (bifocal photography) was taken in a time interval of 3 months using the HRA II (Heidelberg Retina Angiograph II). A reference at the fundus was defined using two characteristic markers. The axial fundus orientation between the markers was overlaid to the line defined by the tIOL axis markers. The angular offset/distance between the fundus orientation line and the tIOL marker line was analyzed for each bifocal image at different time points. RESULTS: The comparison of axial tIOL orientation between both different tIOL images revealed a rotation angle of 13 degrees (monofocal photograph). In contrast, using the bifocal photography and digital overlay technique the fundus line as a reference the tIOL rotated 1 degrees and 4 degrees from the first to the second time point of photography. Thus, the real rotation angle of tIOL measured only 3 degrees. CONCLUSION: The bifocal photography with constant head position has the potential to minimize the intrinsic error in documentation of axial orientation of tIOL.

Aged↗
PubMed2004

[Solid limbal dermoid in an 80-year-old patient].

BACKGROUND: Typically solid limbal dermoids are excised in pre-school age unless a high irregular astigmatism and its risk for amblyopia lead to an earlier intervention. CASE REPORT: An 80-year-old lady from a rural area complained about a burning, tearing and foreign body sensation of the left eye for two months. In the past two years she had recognized that an extraocular prominence which had been present since birth had shown a tendency to grow. Slit lamp examination showed a markedly prominent and vascularized limbal tumor from 3.30 to 7.00 o'clock. Paralleling the border of the mass there was a bow-shaped stromal lipoid deposit reaching from limbus to limbus. Gonioscopic examination revealed a deep penetration of the process almost into the anterior chamber. The tumor was excised and some fatty tissue adjacent to Descemet's membrane was left. Histological assessment brought us to the diagnosis of a chronically irritated, predescemetal limbal dermoid with marked secondary vascularization, epidermalization, elastoid degeneration and degenerative arcus lipoides. CONCLUSIONS: The excision of the limbal dermoid in the described case was performed in the later stage of life. When indicated cosmetically or medically, surgery should typically take place in pre-school age and be performed as a lamellar excision.

Aged↗