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Biomedical subjects

B Ilhan

Publications and source records attributed to B Ilhan.

5 recordsLinked to original sources
PubMed2003

Effects of fibrovascular traction and pooling of tears on corneal topographic changes induced by pterygium.

AIM: To investigate the effects of fibrovascular traction and the pooling of tears at the pterygium apex on the corneal topographic changes induced by pterygium. METHODS: A total of 16 eyes of 14 cases with primary pterygium were included in the study. A computerized corneal topography system was used for corneal topography examinations. Baseline keratographs were taken two times at straight gaze. A repeat corneoscope photograph was immediately obtained in temporal gaze. Then the tears at the pterygium apex were dried with a cellulose sponge, and a new corneoscope photograph was immediately obtained without allowing one to blink. Corneal topographic maps (numeric maps) were divided into 301 fields in 24 meridians. One colour was allocated to each field, representing its mean refractive power for all groups. In all eyes, keratometric astigmatism at the 3 mm central cornea and total mean corneal refractive power were found. Data were compared using paired-samples two-tailed t-tests. RESULTS: Keratometric astigmatism at the 3 mm central cornea was significantly reduced at the temporal gaze (3.10+/-2.34 D, t=3.40, P=0.027) and dried eyes (2.12+/-1.01 D, t=4.74, P=0.001) according to the first baseline measurement (4.31+/-1.91 D) of the total mean corneal refractive power was found to be 43.45+/-1.28 D (39.29-45.87) at the first baseline measurement. There was no change at the temporal gaze (43.54+/-1.06 D, P>0.05). However, the total corneal refractive power was significantly higher in dried eyes (44.26+/-0.93 D, t=34.92, P<0.001). The steepest region of corneal topography was a superior quadrant, and the flattest area was a nasal quadrant at the baseline. At the temporal gaze, the cornea was significantly flatter in the superior and inferior sides of the pterygium meridian. After dried pooling of tears, topographic abnormalities returned, and the cornea became more uniform and symmetric. CONCLUSION: We conclude that the pooling of tears at the pterygium apex plays an important role, but fibrovascular traction has no effect on the corneal topographical changes induced by pterygium.

Adult↗
PubMed1998

Surface deposits on frequent replacement and conventional daily wear soft contact lenses: a scanning electron microscopic study.

PURPOSE: We performed a prospective study to compare the surface deposits on frequent replacement soft contact lenses with deposits on conventional daily wear soft contact lenses. METHODS: We fit two groups of young myopic patients with either conventional daily wear or frequent replacement soft contact lenses. Subjects in both groups wore their lenses on a daily wear basis and used a hydrogen peroxide/catalytic disk based care system. Contact lenses were obtained from patients in the frequent replacement group after 1 month of wear and from the conventional contact lens group after 12 months. Contact lenses from each group were examined with scanning electron microscopy and surface deposits were compared. RESULTS: Frequent replacement lenses were covered with significantly fewer deposits than conventional daily wear soft contact lenses (P = 0.0003). No microorganisms were seen on frequent replacement contact lenses. Bacteria in the form of coccus on two contact lenses were seen in the other group. CONCLUSIONS: Surface deposits occur less often on frequent replacement lenses but they cannot be totally prevented. Surface deposit related contact lens complications may be expected to occur less frequently with the use of frequent replacement lenses.

Adolescent↗
PubMedDate not supplied

The comparison of eyelash lengthening effect of latanoprost therapy in adults and children.

PURPOSE: To compare the eyelash lengthening effect of latanoprost in adults and children with glaucoma. METHODS: Twenty eyes of 13 men and 7 women (mean age: 54.9, range 42-69 years) with primary open-angle glaucoma and 20 eyes of 9 boys and 11 girls (mean age: 10.7, range 6-16 years) with glaucoma were included in this prospective study. In 19 children, juvenile glaucoma and in one, pseudophakic glaucoma had been detected. A single eyelash was pulled from the center of the upper eyelid before latanoprost therapy and at the sixth month of therapy, and measured. RESULTS: In adult cases, the mean eyelash length was 5.79+/-0.18 mm (5.5-6.1 mm) at baseline and 6.45+/-0.21 mm (6.2-6.8 mm) at the sixth month. In children, the mean length was 5.66+/-0.22 mm (5.3-6.0 mm) at baseline and 6.39+/-0.37 mm (5.9-6.9 mm) at the sixth month. The mean difference in eyelash lengths at baseline and the sixth month was 0.67+/-0.09 mm (0.5-0.7 mm) in adults and 0.75+/-0.25 mm (0.4-1.2 mm) in children. CONCLUSIONS: The differences in mean eyelash lengths at baseline and at the sixth month of latanoprost therapy were statistically significant in both adults and children (p=0.000). The mean of the difference of the eyelash length in children was higher than in adults but the result was not statistically significant (p=0.678).

Adolescent↗
PubMedDate not supplied

Ophthalmic manifestations of Gilles de la Tourette syndrome.

PURPOSE: To present the ophthalmic manifestations of patients with Gilles de la Tourette syndrome (GTS). METHODS: Sixteen children (average age 11.5 years), with multiple motor and vocal tics, with a diagnosis of GTS, were included in this study. All underwent a full ophthalmological examination. RESULTS: All patients except one amblyopic case had best corrected visual acuity of 20/20 in both eyes. Eleven patients (68%) had eye tics; nine had clonic blepharospasm and two had involuntary gaze deviations. Four cooperative children underwent visual field examination with Goldmann perimeter, no visual field defect was detected. Three patients had strabismus (one alternating exotropia and two partially accommodative esotropia). Anterior and posterior segment examinations were within normal limits. The symptoms improved considerably in 82% of the patients with eye tics on treatment with a neuroleptic (pimozide). CONCLUSIONS: Blepharospasm was the most common ophthalmic manifestation of GTS. Ophthalmologists should consider a diagnosis of GTS in the absence of any organic eye pathology that may cause blepharospasm and refer these cases to a child psychiatrist. These children benefit from a treatment with neuroleptics under the supervision of a psychiatrist.

Adolescent↗