Changes in Corneal Sensitivity after Laser in-situ Keratom ileusis

To evaluate the changes of corneal sensitivity after LASIK, we measured corneal sensitivity threshold at 5 regions of cornea using Cochet-Bonnet aesthesiometer in 41 myopic eyes of 23 patients who underwent LASIK. Corneal sensitivities were tested in the Central, medial, superior, temporal and inferior region of cornea preoperatively and postoperatively. Central corneal sensitivity was reduced to 1.1+/-4.6% of preoperative sensation at 1 day postoperatively and gradually recovered showing 40.3+/-27.8% at 3 months postoperatively. The sensitivity of the central region was the lowest of all significantly and medial region was the highest(p0.05). There were no overall differences in the sensitivities of the superior, temporal and inferior regions(p>0.05) and their sensitivities were higher than that of central region and lower than that of medial region. The amount of preoperative myopia and the thickness of corneal flap showed no significant correlation with the decrease of postoperative corneal sensitivity(r0.05).

Clinical Characteristics of Branch Retinal Vein Occlusion with Vitreous Hemorrhage

Forty three eyes with vitreous hemorrhage caused by branch retinal vein occlusion had been underwent pars plana vitrectomy and followed-up over 6 months. The eyes were classified into 4 groups according to intraoperative fundus findings-group 1; vitreous hemorrhage only, group 2; vitreous hemorrhage with fibrovascular proliferation, group 3; vitreous hemorrhage with traction retinal detachments, group 4; vitreous hemorrhage with rhegmatogenous retinal detachments. Analysis was focused on the clinical characteristics and postoperative outcome in each group. The durations of vitreous hemorrhage were longer significantly in group 2 and group 3. The vision improved postoperatively in 35 of 43 eyes(81.3%). The percentage of postoperative visual improvements was 100%(18 of 18 eyes) in group 1, 85.7%(12 of 14 eyes) in group 2, 66.6%(4 of 6 eyes) in group 3, and 20$(1 of 5 eyes) in group 4. The preoperative ultrasono-graphic findings of retinal status were accorded with intraoperative retinal findings in 74.4% of eyes.

Clinical Characteristics of Duane's Retraction Syndrome

In this study, we reviewed 46 consecutive patients with diagnosis of Duane's retraction syndrome at the Seoul National University Hospital from April, 1987 to October, 1995. The following characteristics were reviewed - sex, laterality, clinical type, primary position alignment, anomalous vertical movements, head turn, fusion and amblyopia. The incidence in each sex showed no difference(male: 54%, female:46%). Ninety-six percent of cases had a unilateral manifestation and 4% of cases had bilaterality. The left eyes were involved in 70% of cases and the right eyes in the 26% of cases. Type I was the most common type(96%) and the esodeviations were the most frequent in primary position. Head turns were observed in 77% of cases and the direction of head turns were toward the involved eyes in esodeviations, and away from the involved eyes in exodeviations regardless of the clinical types. Among 26 patients who underwent the fusion test, seventeen patients(65%) had fusion and that was more common in patients with exodeviation(83%) than others.

Relationship between optic nerve head parameters of Heidelberg Retina Tomograph and visual field defects in primary open-angle glaucoma

To investigate the correlation between optic nerve head configuration and visual field defects, optie nerve head analysis using confocal scanning laser tomography (Heidelberg Retina Tomograph, HRT) and automated static threshold perimetry using a Humphrey Field Analyzer (program C3O-2) were performed on 81 eyes of 44 primary open-angle glaucoma (POAG) patients. The optic nerve head parameters-rim area, rim volume, mean retinal nerve fiber layer thickness, height variation contour, and third moment in contour were measured by HRT and were analyzed for correlation with visual field indices-mean deviation, and corrected pattern standard deviation. All optic nerve hend parameters except HVC correlated significantly with the visual field indices; the highest correlation was between rim area and mean deviation (r = 0.6172, p < 0.O0001). The rim area of the superior and inferior quadrants correlated significantly with the visual field defects in corresponding sectors. Structural optic disc measurements by HRT correlated significantly with funetional optic nerve head damage in POAG

The Surgical Outcome of Clear Lens Extraction for Correction of Severe High Myopia

The authors performed clear lens extraction to treat severe high myopia more than 12 diopters (D) of 24 eyes. The changes in spherical equivalent (S.E). visual acuity improvement, and the complications were evaluated during the average 15 months follow-up period. A scleral pocket incision and continuous curvilinear capsulohexis was made and lens extraction was performed via phacoeomulsification and low power posterior chamber intraocular lens was implanted. The postoperative refractive error targets were -1.0 D in 16 eyes. and -3.0 D in 8 eyes. Sixty-two percent(15/24 eyes) of eyes were within +/-1 D of targeted refractive error and 91.7%(22/24 eyes) of eyes were within +/-2 D of targeted refractive error. The postoperative uncorrected visual acuities were increased in all cases and 95.8%(23/24 eyes) of eyes gained two or more lines. There were increase in uncorrected visual acuity achieving 20/200 or more from 0% to 95.8%(23/24 eyes) postoperatively. The postoperative corrected visual acuities were increased in 83.3%(20/24 eyes) and 75%(15/20 eyes) among them gained two or more lines. The corrected visual acuity of 20/40 or better were increased from 41.7%(10/24 eyes) preoperatively to 79.2%(19/24 eyes) postoperatively. Posterior capsular opacification was developed in one eye and YAG laser posterior capsulotomy was performed at 4 months postoperatively. No retinal break, no retinal detach ment, no cystoid macular edema were developed during the follow-up period. In conclusion, the clear lens extraction was effective method for correction of severe high myopia but longer follow-up of large number of cases is needed to fully assess the complications.