[Mitomycin C and pterygium resection].
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Humans↗
Biomedical subjects
C Barraquer
Publications and source records attributed to C Barraquer.
[In situ keratomileusis with Excimer laser for hypermetropia. Preliminary results].
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Humans↗
Results of laser in situ keratomileusis in hyperopic compound astigmatism.
PURPOSE: To evaluate the efficacy and safety of steepening the flatter meridian with laser in situ keratomileusis (LASIK) to correct hyperopic compound astigmatism using the Schwind-Keratom laser with the MultiScan System and the active tracking system for centering the ablation. SETTING: Instituto Barraquer de América, Bogotá, Colombia. METHODS: From June to December 1997, LASIK was performed in 111 eyes to correct congenital hyperopic compound astigmatism. Preoperatively, the mean spherical equivalent was +2.58 diopters (D) (range +1.50 to +3.50 D) in 37 eyes (low dioptric group), with a mean sphere of +3.66 D (range +1.75 to +5.50 D) and a mean cylinder of -2.11 D (range -0.50 to -5.00 D); +4.71 D (range +3.51 to +6.00 D) in 50 eyes (middle dioptric group), with a mean sphere of +5.58 D (range +4.00 to +7.00 D) and a mean cylinder of -1.83 D (range -0.50 to -4.50 D); and +7.26 D (range +6.01 to +10.00 D) in 24 eyes (high dioptric group), with a mean sphere of +8.25 D (range +6.50 to +10.00 D) and a mean cylinder of -1.98 D (range -0.50 to -4.00 D) in 24 eyes. Postoperative results were measured at 10 days and 6 months. RESULTS: At 6 months, the mean residual subjective spherical defect was +0.32 D (range -0.50 to +1.00 D) in the low dioptric group, with a mean cylinder of -0.61 D (range 0.00 to -1.75 D); all eyes were within +/- 1.00 D of emmetropia. The mean defect was +0.82 D (range 0.00 to +2.50 D) in the middle dioptric group, with a mean cylinder of -0.61 D (range 0.00 to -2.50 D); 80% of eyes were within +/- 1.00 D of emmetropia. The mean defect was +1.10 D (range -0.50 to +3.00 D) in the high dioptric group, with a mean cylinder of -1.39 D (range 0.00 to -3.25 D); 77% of eyes were within +/- 1.00 D of emmetropia. In the study group as a whole, 90% of eyes had a cylinder correction within +/- 1.00 D of emmetropia. Uncorrected visual acuity (UCVA) was 0.50 (20/40) or better in 23.4% of eyes preoperatively and 0.50 (20/40) or better in 71.0% 6 months postoperatively. CONCLUSIONS: Steepening the flatter meridian with the MultiScan System safely and effectively corrected hyperopic astigmatism. The rapid recovery of UCVA was due not only to correction of the ametropia, but also to the centering provided by the active tracking system.
Adolescent↗
Management of severe flap wrinkling or dislodgment after laser in situ keratomileusis.
PURPOSE: To review the management and results of cases with severe flap wrinkling or dislodgment after laser in situ keratomileusis (LASIK). SETTING: University Eye Center, Department of Ophthalmology and Visual Sciences, Prince of Wales Hospital, The Chinese University of Hong Kong. METHODS: Four patients with severe flap wrinkling or dislodgment after LASIK are described. Surgical repositioning of the flap was performed in all cases. Flap status, refractive changes, and final uncorrected and best corrected visual acuities were used to evaluate the outcome of flap repositioning. RESULTS: Flap repositioning required suturing in 2 patients, 1 of whom developed severe epithelial ingrowth with melting of the corneal flap and stromal bed and eventually required flap removal. The stromal inflammation resolved, and the corneal surface re-epithelialized after flap excision. In 2 other patients, wedge-shaped tissue excision (1.0 x 1.5 mm) from the superior portion of the corneal flap was necessary to allow better flap realignment. In 1 of these patients, the corneal flap was eventually converted to a free cap to correct residual wrinkling. At a mean follow-up of 15 months, the postoperative uncorrected visual acuity ranged from 20/20 to 20/60, and the best spectacle-corrected visual acuity (BSCVA) was 20/30 or better in all patients. In 1 patient, BSCVA decreased by 1 line. CONCLUSIONS: Flap dislodgment and wrinkling are serious postoperative complications of LASIK. Early recognition of these complications and prompt surgical management are crucial to achieve a successful surgical and visual outcome.
Adult↗
[Corneal reinnervation after keratomileusis in situ and keratomileusis myopica--a comparison].
BACKGROUND: In a retrospective study corneal sensitivity after keratomileusis in situ and keratomileusis myopica was measured. METHOD: 5 points on the cornea were measured with the Draeger aesthesiometer at 18 eyes after keratomileusis myopica and at 66 eyes after keratomileusis in situ. RESULTS: The ingrowth of corneal nerve fibres is delayed after keratomileusis myopica compared to keratomileusis in situ because of delayed stromal repopulation of keratocytes and disturbances of stromal metabolism due to toxic effects of the cryopreservation solution.
Adolescent↗
[Corneal reinnervation after lamellar refractive corneal surgery].
In a retrospective study corneal sensitivity after refractive autokeratoplasty for correction of myopia was measured. Thirty-eight patients operated on for keratomileusis in situ and 18 patients for keratomileusis myopica were examined with the Draeger esthesiometer between 1 and 23 months after surgery. Three measurements points were on the refractive disc, two others on the untouched cornea. After keratomileusis myopica, the corneal reinnervation is significantly delayed compared to keratomileusis in situ. In the first group sensitivity is normal after 2 years and in the second group after 1 year. Even refraction and visual acuity depend on metabolism and reorganization of the tissue after surgery. Besides retarded cell repopulation and disturbed stromal metabolism--caused by toxic and cryopreservation effects--the dissection depth of the refractive ablation is responsible for these phenomena.
Adolescent↗
Incidence of retinal detachment following clear-lens extraction in myopic patients. Retrospective analysis.
OBJECTIVE: A retrospective study was performed to establish the incidence of retinal detachment among 107 patients (165 eyes) with pathologic myopia who underwent clear-lens extraction. INTERVENTIONS: The techniques employed were intracapsular extraction (3.0%), aspiration (59.4%), and extracapsular extraction (37.6%); average follow-up was 31 months. RESULTS: Retinal detachment developed in 12 eyes (7.3%) an average (SD) of 30.7 +/- 26.6 months postoperatively; the mean age of these patients was 34 years. We found a clear association between postoperative YAG laser/surgical posterior capsulotomy and the incidence of retinal detachment (11% vs 5.5%) but no association between intraoperative rupture of the posterior capsule and the ultimate incidence of retinal detachment. The retina was reattached in nine cases (75%).
Adult↗
Myopic keratomileusis: short-term results.
The first 97 eyes operated with keratomileusis by two surgeons starting to use this technique are evaluated. The 30- and 90-day postoperative results of this initial experience are reported. Average preoperative myopia was -10.53 D spherical equivalent (range -5.25 to -22.25 D); average refractive correction at 90 days was -10.20 D. Preoperative visual acuities without correction were between 0.01 and 0.15 Snellen scale (20/2000 to 20/133), and 90 days postoperatively they varied between 0.02 and 0.60 Snellen scale (20/1000 to 20/33) with an average of 0.29 (20/69). Average preoperative visual acuity with correction was 0.70 Snellen scale (20/29), and 90 days afterward it was 0.60 Snellen scale (20/33). Preoperative average refractive cylinder was 1.33 D and postoperative was 1.86 D, showing that significant amounts of astigmatism were not induced.
Adolescent↗