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

C.F.F. in 14 normal eyes with normal visual acuity was examined at central, 5 degrees and 10 degrees to the nasal and temporal portion in the horizontal meridians with rotating sectored disc(light dark ratio=1:1). The distance between the target and the subject was 50cm. 1. C.F.F. was higher in the mydriatic state than in the miotic state, examined with the suround illumination of 50 lux. 2. C.F.F. was higher with 2cm target than with 1cm target, examined with the surround illumination of 50 lux in the mydriatic state. 3. C.F.F.was higher in the light adapted state than in the dark adapted state, examined in the mydriatic state. 4. The more the examined field located peripherally, the higher the C.F.F.
Lighting ; Meridians ; Visual Acuity

No abstract available.
Child* ; Humans ; 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

Prisms have been used as tools with which to treat and diagnose many diseases in strabismology. But, because of prismatic distortion and dispersion, the visual acuities are declined. The purpose of this study is to show the relationship between prismatic effect and visual acuity degradation. Visual acuities were measured through a series of prisms of CR-39 to quantify the blur induced by prism. The mean visual acuities of myopias and amblyopias(with or without correction), and emmetropias were reduced as prism diopters were increased. The declines were linear. There was no significant difference among the declines of visual acuities of each group. Whenever to prescribe prisms and to test with prisms, we should remind that prisms could reduce visual acuities.
Emmetropia ; Myopia ; Visual Acuity*

To evaluate the predictability of visual outcome in vaculopathy patients after treatment, we compared the difference between the pre-treatment visual acuity measured by hand-held laser interferometer and the posttreatment corrected visual acuity using Han`s visual acuity chart. Disease distribution was as follows; BRVO(18 cases), CRVO(11 cases), CSCR(9 cases), posterior uveitis(4 cases). The mean up period was 3.45 months. Among 42 cases, 28 eyes showed positive disparity and 13 eyes showed negative disparity. The range of disparity was from -0.2 to +0.3(mean 0.113). The post-treatment visual acuity was predictable within 2 lines in 38 eyes(90%) We concluded that the hand-held laser interferometer is one of the reliable methods to predict the post-treatment visual acuity in maculopathy patients.
Humans ; 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*

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

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*