PURPOSE: To evaluate the relationship between foveal thickness and axial length and refractive power in healthy Koreans. METHODS: Ninety-eight healthy eyes were studied. The axial length was measured using A-scan (Paradigm mode p45, Kent, U.K.) and refractive power using automatic refractor Automatic refractor(HARK-599, Carl Zeiss, USA). The subjects were divided into 2 groups based on axial length (>or=25 mm and <25 mm) and refractive power (-6.0D). The foveal thickness was measured using OCT 3000 (Optical Coherence Tomography, Carl Zeiss, USA) and the statistical relationship between the 2 groups was analyzed by independent t-test. RESULTS: There was no statistically significant difference found in foveal thickness according to axial length between the two groups (p>0.05) nor according to refractive power (p>0.05). CONCLUSIONS: When eyes with pathologic myopia were excluded, The axial length and refractive power of the eyes had no relation to foveal thickness measured by OCT.
Myopia

A survey on the myopia in 579 pupils of 2 primary schools o Tan Mai and Van Noi in Ha Noi was carried out. Results showed that: light intensity was at the hygienic standard, but in some sitting places the ligh intensity was too high. The height of the desks were not compatible with the height of the pupils. The poor vision was 17%, the refraction problem was 24%, hypermetropic myopic astigmatism were 11%, some influence factors to vision disorder of the pupils were found out initially. The vision disorder of the pupils at Tan Mai school was significant higher than this in Van Noi school.
Myopia ; Astigmatism

Studies on 5,050 pupils at 3 levels of primary education in Ha Noi, Nam Dinh and Thai Nguyen during 1999-2001 showed that: the myopia of pupils had increased by the learning grade. The myopia rate of pupils in urban areas is higher than that in suburb areas. Some factors were related closely to the rate of myopia including the lighting level inside classes, the dimensions of tables and desks, the sitting position of pupils in classes
Myopia ; Pupil

To investigate general misconception on the eye problems, we have reported the misconception of students of middle school, high school and college for the first report. For its etiological study, we studied the false descriptions on the eye problems in the textbooks of primary school, middle school and high school. We found the false descriptions in terminology, causes of the myopia, contact lens and conjunctivitis(Trachoma). The result suggests that the main causes of misconception on the eye problems of students are the false descriptions on the textbooks of primary school, middle school and high school.
Humans ; Myopia

To investigate general misconception on the eye problems, we have reported the misconception of students of middle school, high school and college for the first report and the false descriptions on the eye problems in the textbooks of primary school, middle school and high school. As the third report, we have investigated the errors on the ophthalmic problems which were found on the health related books sold on the bookstore. We found the errors in 27 books among about 50 books. The errors about the myopia were the most prevalent(in 10 books) among them.
Humans ; Myopia

Humans ; Myopia

Objective: This small case series demonstrated pars plana vitrectomy and silicone tamponade without internal limiting membrane (ILM) peeling to be a simple, safe, and effective surgical technique for the treatment of myopic traction maculopathy (MTM). Methods: This is a small case series consisting of 3 eyes with MTM. In all eyes, pars plana vitrectomy with silicone oil tamponade was performed by a single vitreoretinal surgeon. Functional and anatomic outcomes are reported. Results: All 3 eyes had improved visual acuity with no noted short-term complications such as iatrogenic macular hole and retinal detachment. Although foveoschisis was only partly anatomically resolved in 2 out of the 3 cases, functional outcome, in terms of visual acuity at last visit, was satisfactory. Conclusion Vitrectomy with silicone oil tamponade without ILM peeling is a simple, effective, and safe optional surgical technique to treat MTM.
pathologic myopia

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*

Corneal haze and myopic regression are not uncommon complications following photorefractive keratectomy(PRK). To avoid these problems, multipass multizone technique has been introduced. However, it is quite difficult to coincide the center of the each ablation zone during the procedure and needs to take longer operation time. Single-pass multizone software was replaced by Summit technology(USA). The current study evaluates the clinical results of single-pass multizone PRK for high myopia. We performed PRK using single-pass multizone technique on 48 eyes of 44 patients for the treatment of high myopia. Preoperative spherical equivalent refractions ranged from -8.00 diopters((D) to -16.00 D (mean+/-SD, -11.01 +/- 1.84 D). Mean postoperative refraction was +1.12 +/- 1.20 D at one month, -0.42 +/- 1.24 D at six months, and -0.92 +/- 1.09 D at one year. The percentage of patients achieving correction within +/-2.0 D was 79.2% at one month, 85.4% at six months, and 88.2% at one year postoperatively. There was no serious complications after surgery. This study provides evidence that single-pass multizone PRK is a safe, simple and fairly predictable method for high myopic correction. But further studies are needed to confirm the longer-term stability.
Humans ; Lasers, Excimer* ; Myopia*

Corneal haze and myopic regression are not uncommon complications following photorefractive keratectomy(PRK). To avoid these problems, multipass multizone technique has been introduced. However, it is quite difficult to coincide the center of the each ablation zone during the procedure and needs to take longer operation time. Single-pass multizone software was replaced by Summit technology(USA). The current study evaluates the clinical results of single-pass multizone PRK for high myopia. We performed PRK using single-pass multizone technique on 48 eyes of 44 patients for the treatment of high myopia. Preoperative spherical equivalent refractions ranged from -8.00 diopters((D) to -16.00 D (mean+/-SD, -11.01 +/- 1.84 D). Mean postoperative refraction was +1.12 +/- 1.20 D at one month, -0.42 +/- 1.24 D at six months, and -0.92 +/- 1.09 D at one year. The percentage of patients achieving correction within +/-2.0 D was 79.2% at one month, 85.4% at six months, and 88.2% at one year postoperatively. There was no serious complications after surgery. This study provides evidence that single-pass multizone PRK is a safe, simple and fairly predictable method for high myopic correction. But further studies are needed to confirm the longer-term stability.
Humans ; Lasers, Excimer* ; Myopia*