Using Life-Tech instrument(Visulab 5102 recorder, 7330 black and white visual pattern stimulator, 5402A averager, and 5874 P1 preamplifier), normal VEP was measured on 49 healthy person(98 eyes) aged from 23 to 27yrs with visual acuity better than 0.9. The frequency of stimulus was 2Hz, averaged 128 responses and analysis time was 250ms. The check size was 60min horizontally and 50min vertically. The mean P1 latency of 98 eyes was 96.81 +/- 7.51ms. The mean P1 latency of 49 right eyes was 96.78 +/- 7.98ms and that of left eyes was 96.88 +/- 7.20ms. The difference between right and left eye was not significant statistically(p>0.05). The amplitide of VEP was so variable that it was excluded from this analysis.
Visual Acuity

PURPOSE: To evaluate posterior capsular opacity (PCO) using straylight and glare sensitivity meter and to compare availability of straylight and glare sensitivity with known methods for PCO evaluation. METHODS: Thirty-six pseudophakic eyes with PCO were selected for this study. Best-corrected visual acuity (BCVA), straylight (C-quant, Oculus GmbH, Wetzlar, Germany) and glare sensitivity (Binoptometer, Oculus GmbH, Wetzlar, Germany) were measured before mydriasis. After mydriasis, PCO images were captured with a slit-lamp and analyzed using the Evaluation of Posterior Capsular Opacification (EPCO) program (EPCO software, University of Heidelberg, Heidelberg, Germany). The same measurements were taken after capsulotomy and compared with pre-capsulotomy data. RESULTS: After capsulotomy, BCVA, EPCO score and straylight were improved with statistical significance (p < 0.05). Cases of PCO with mildly decreased visual acuity showed statistically significantly improved EPCO score and straylight (p < 0.05). Glare sensitivity did not show significant improvement but was statistically significantly correlated with straylight (p = 0.023, Rho = 0.732). CONCLUSIONS: Straylight is an available measurement for evaluation of PCO. Glare sensitivity meter which correlates with straylight can be used as a supportive measurement.
Glare* ; Mydriasis ; Visual Acuity

PURPOSE: To evaluate posterior capsular opacity (PCO) using straylight and glare sensitivity meter and to compare availability of straylight and glare sensitivity with known methods for PCO evaluation. METHODS: Thirty-six pseudophakic eyes with PCO were selected for this study. Best-corrected visual acuity (BCVA), straylight (C-quant, Oculus GmbH, Wetzlar, Germany) and glare sensitivity (Binoptometer, Oculus GmbH, Wetzlar, Germany) were measured before mydriasis. After mydriasis, PCO images were captured with a slit-lamp and analyzed using the Evaluation of Posterior Capsular Opacification (EPCO) program (EPCO software, University of Heidelberg, Heidelberg, Germany). The same measurements were taken after capsulotomy and compared with pre-capsulotomy data. RESULTS: After capsulotomy, BCVA, EPCO score and straylight were improved with statistical significance (p < 0.05). Cases of PCO with mildly decreased visual acuity showed statistically significantly improved EPCO score and straylight (p < 0.05). Glare sensitivity did not show significant improvement but was statistically significantly correlated with straylight (p = 0.023, Rho = 0.732). CONCLUSIONS: Straylight is an available measurement for evaluation of PCO. Glare sensitivity meter which correlates with straylight can be used as a supportive measurement.
Glare* ; Mydriasis ; Visual Acuity

We compared postoperative visual outcome and corneal refractive power depending on preoperative corneal topographic pattern and the predictibility of corneal topographic measurement compared with keratometric measurement after PRK. The subjects were 91 eyes divided into two goups composed of 44 eyes, symmetric bow tie type(SB) and 47 eyes, asymmetric bow tie type (aSB). The visual acuity, central power, and topographic pattern were measured before operation, postoperative 1 week, 1, 2 and 6 month in two groups, but no statistical difference(p>0.05). The averages of uncorrected visual acuity at 6 month were improved to 0.80(SB) and 0.85(aSB) from 0.09(SB) and 0.11(aSB) before operation. Topographic central refractive powers of +42.98D (SB), +43.32D(aSB) before operation were changed to +37.68D(SB), 37.56D(aSB) at 6month. The pattern of the region affected by the excimer laser was classified by key hole type 38%(SB) , 34%(aSB) , uniform roud type 41%(SB), 43%(aSB), semicircular type 21%(SB), 23%(aSB). The proportion of the difference less than one diopter between PRK setting and the change of the corneal refractive power at 6month was 36% and 76% in keratometric and topographic measurement. Above results show that the asymmetricity of bow tie type did not influence the visual outcome. The topographic measurement was better than keratometric measurement in evaluating the corneal refractory change after PRK.
Lasers, Excimer* ; Visual Acuity

No abstract available.
Strabismus* ; Visual Acuity*

Authors experienced five different cases of keratitis such as metaherpetic keratitis, bullous keratitis, chemical keratitis and superficial punctate keratitis have been markedly improved by subconjunctival injection of Tathion (30-50mg), a glutathion prepartion. All cases showed remarkable improvement with better visual acuity following the treatment. Especially it was another choice of treatment in persisting case of metaherpetic keratitis with parenchymal infiltration. No side effects have been observed during this procedure.
Keratitis* ; Visual Acuity

No abstract available.
Child* ; Humans ; Visual Acuity*

Sixteen normal subjects were tested with the Titmus stereotest varying the binocular Snellen's visual acuity from 1.0 to 0.2. From 15 possible combinations, a nomogram describing the relationship of binocular variations of Snellen's visual acuity and stereoacuity was constructed and the relationship of binocular isoacuities to Titmus stereotest performance was expressed as an S-shaped function.
Nomograms ; Telescopes ; Visual Acuity*

We performed coreoplasty on drawn pupils(17 eyes) by using Argon laser only or Argon laser combined with Q-switched Nd:YAG laser from June 1983 to May 1989. The results were as follows; 1. The causes were divided by 7 eyes(41.2%) with trauma and 10 eyes(58.8%) without trauma. 2. There were 15 eyes(88.2%) in up-drawn pupils and 2 eyes(11.8%) in downdrawn pupils. 3. The degree of preoperative drawn pupil was 1.42mm in average and enlargement of postoperative drawn pupil was 1.25mm in average. The corrected effect for preoperative drawn pupil and postoperative drawn pupil and postoperative drawn pupil was shown as 2.58mm in average. 4. Postoperative corrected visual acuity improved fairly. It was same as preoperative corrected visual acuity in 4 eyes(23.5%) and improved in 13 eyes(76.5%).
Argon ; Pupil ; Visual Acuity

One hundred and twenty-three cases of planned ECCE with biconvex posterior chamber lens implantation were performed in St. Mary's Hospital from April 1988 to February 1990, were followed up for more than 6 months. We also analyzed 123 cases of planned ECCE with convex-plano posterior chamber lens implantation during the same period. The results were as follows: 1. The difference of visual acuity between the two groups was not statistically significant. 2. Of the 123 eyes with biconvex lens, 106 eyes (86%) were within +/- 0.50 spherical equivalent diopter compared to 55 of 123 eyes (44.7%) with convex-plano lens. This difference is statistically signficant (p<.001). 3. Eight out of the 123 eyes with biconvex lens (6.5%) developed after-cataract and two of these eight eyes were of the central type: 36 out of the 123 eyes (29.3%) with convex-plano lens developed after-cataract and 31 of the these 36 eyes were of the central type. This difference is statistically significant(p<.001).
Cataract* ; Visual Acuity