• Title/Summary/Keyword: Corrected visual acuity

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Follow-up Study on the Changes of Refractive Error for Ten Years in Children and Teenagers in an Optometric Practice (안과 병원을 내원한 소아 청소년의 10년간 굴절이상도 변화 추적연구)

  • Ha, Na-Ri;Kim, Hyun-Jung
    • Journal of Korean Ophthalmic Optics Society
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    • v.16 no.4
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    • pp.425-431
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    • 2011
  • Purpose: For better understanding refractive error in Korean children and teenagers, a follow-up study on the changes of refractive error was performed in 1~13-year-old subjects for ten years. Methods: Among the people who had visited an ophthalmologic hospital in Seoul to examine the visual acuity and to correct refractive error from 2000 to 2010 years, 223 subjects (364 eyes) having the corrected visual acuity over 0.7 had been investigated the changes of spherical equivalent power of the cycloplegic clinical refraction and manifest clinical refraction from the accumulated medical record data for ten years. Results: The changes of spherical equivalent power for ten years in 1 to 13 years old were shown the highest change at 7-year-old. And annual change of spherical equivalent power was shown the highest change at from 9-year-old to 10-year-old (-0.64${\pm}$0.64 D) followed by from 8-year-old to 9-year-old (-0.64${\pm}$0.81 D). Conclusions: The changes of refractive error for Korean children and teenagers aged 1 to 13 years in an optometric practice were shown the tendency to proceeding to myopia with age, especially the largest increase at from 7-year-old to 10-year-old, and this period is important for vision care.

Research a Person's Eyesight Changes on According to the Optimum Color Temperature for the Stand Lamp Using White Light LED Sources (백색광 LED를 사용한 독서등의 최적 색온도에 따른 사람의 시력 변화 연구)

  • Kim, Juhyun;Chang, Wonbeom;Lee, Seokhwan;Jung, Kwangkyo;Kim, Donghyun;Kim, Jeongmi;Ryu, Jaejun;Moon, Seongdeuk;Lee, Seunghyun;Ko, Youngsu;Huh, San;Jang, Mina;Jung, Changho;Chang, Jiho
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.26 no.1
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    • pp.80-82
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    • 2013
  • White light emitting diode (LED) determined the most appropriate color temperature in reading lighting evaluated fatigue degree of eye according to color temperature. The eye fatigue degrees are determined by brightness and color temperature. Therefore, we measured the results of eyes test according to the change of color temperature and brightness. Experiments except for astigmatic corrected visual acuity of 0.8 more and age 20 to 25 years old, male and female college students was conducted in 100 patients. And constant illumination conditions, visual acuity was measured by varying the color temperature. The optometry at 10 minutes in the darkroom adapted eye. And then the temperature of $25{\pm}3$ degrees, the humidity was carried out at $50{\pm}5%$. As a result of typical color temperature of white light (5,600 K) has identification of the readability.

A Study on the Stability Fatigue according to the Accommodation Change due to the Use of Smartphone (스마트폰의 사용으로 인한 조절 변화에 따른 안정피로도에 대한 연구)

  • Kim, Bong-Hwan;Han, Sun-Hee;Park, Seon-Mi;Bae, Sang-Bin;Woo, Yong-Jun;Song, Gyeong-Jun;Bang, Eun-Min;Seo, Da-Eun
    • Journal of Korean Clinical Health Science
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    • v.8 no.1
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    • pp.1362-1368
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    • 2020
  • Purpose. In this study, The change of the accommodation function due to the use of a smartphone was objectively evaluated using an Auto Refractokeratometer and was to investigate the effect of accommodation response and microfluctuations of accommodation on stable fatigue. Methods. Twenty subjects (20 males, 20 females) who had no abnormalities in ophthalmic disease and strabismus, diplopia, suppression, convergence and ocular movement, and corrected visual acuity and unaided visual acuity of 0.8 or more were performed. The average age of the participants is (21.78 ± 1.78) years old. The refractive power of the eye was measured using an Auto Refractokeratometer (Speedy-i K-model, Righton Mfg Co. Tokyo Japan), and the equivalent spherical power was automatically calculated from the measured refractive power. The accommodation response amount was calculated for the accommodation stimulation amount in 8 steps in 0.5D increments from + 0.50D to -3.00D in the calculated equivalent spherical power. The microfluctuations of accommodation in the high frequency region was calculated according to the change in the amount of the accommodation stimulus. At this time, the spectral power of the microfluctuations of accommodation was analyzed by Fast Fourier Transformation (FFT). Results. After using the smartphone, it was found that the accommodation response to accommodation stimulation decreased and the microfluctuations of accommodation increased. Conclusions. It can be said that the use of a smartphone affects the accommodation response and the microfluctuations of accommodation, thereby causing a accommodative stable fatigue. Therefore, it is thought that the use of a smartphone for a long time may bring about a change in the accommodation function.

The State and Problem of the Soft Contact Lens Wearer (소프트 콘택트렌즈 착용자의 실태와 문제점)

  • Kim, Douk-Hoon;Hwang, Sun-Young
    • Journal of Korean Ophthalmic Optics Society
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    • v.3 no.1
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    • pp.249-258
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    • 1998
  • This study was researched the state and problem of the soft contact Lens wear by the history and inverted microscopy. The results was as follows; 1. The first use of contact lens wear was the 15 years and the last use was the 26 years. The first age of most contact lens wear was the 19 years. 2. In the almost contact lens wearers, the first visual test was the optical shop. 3. At present, almost soft contact lens purchase the optical shop 4. At present, most contact lens wearer like a soft type. 5. At present, most soft contact lens were a domestic production, and some subjects were foreign country production, but some subjects were unknown. 6. After contact lens wear, most subjects don't known the corrected visual acuity, especially, almost people don't known the binocular visual acuity. 7. At present, on soft contact lens color, the teens like the non-color contact lens, twenties like the color contact lens, but thirties was not known. 8. On the advantage of soft contact lens knowledge, most teens and twenties were only one, thirties was unknown. 9. On the disadvantage of soft contact lens knowledge, most teens and thirties were only one, twenties were two. 10. On the side effect of soft contact lens wearer, teens was one, and twenties and thirties don't known. 11. On the main symptoms of soft contact lens wearer, total kinds were seven, On these kinds, most subjects were not symptoms, the next order was unknown on the symptom. But, On the symptoms, the main symptoms was the pain and dry eye. 12. At present, the research on the surface morphology of soft contact lens by inverted microscope, the lens repture, lens folding, foreign body immersion and etc were present. Above the study, most contact lens was soft lens, and the purchase was the optical shop, on the other hand, the knowledge of soft contact lens and visual acuity was few. As a results, On the practical problems of soft contact lens wear, the optician have to the soft contact lens treatment and aftercare by law and educational supporting.

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Long-term Results of Taking Anti-oxidant Nutritional Supplement in Intermediate Age-related Macular Degeneration (중기 나이관련황반변성 환자에서 항산화영양제 복용 후 장기 관찰 결과)

  • Bang, Seul Ki;Kim, Eung Suk;Kim, Jong Woo;Shin, Jae Pil;Lee, Ji Eun;Yu, Hyeong Gon;Huh, Kuhl;Yu, Seung-Young
    • Journal of The Korean Ophthalmological Society
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    • v.59 no.12
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    • pp.1152-1159
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    • 2018
  • Purpose: We prospectively investigated clinical changes and long-term outcomes after administration of the drugs recommended by the Age-Related Eye Disease Study-2 to patients with intermediate age-related macular degeneration (AMD). Methods: This prospective multicenter study enrolled 79 eyes of 55 patients taking lutein and zeaxanthin. The primary endpoint was contrast sensitivity; this was checked every 12 months for a total of 36 months after treatment commenced. The secondary endpoints were visual acuity, central macular thickness, and drusen volume; the latter two parameters were assessed using spectral domain optical coherence tomography. Results: The mean patient age was $72.46{\pm}7.16years$. Contrast sensitivity gradually improved at both three and six cycles per degree. The corrected visual acuity was $0.13{\pm}0.14logMAR$ and did not change significantly over the 36 months. Neither the central macular thickness nor drusen volume changed significantly. Conclusions: Contrast sensitivity markedly improved after treatment, improving vision and patient satisfaction. Visual acuity, central retinal thickness, and drusen volume did not deteriorate. Therefore, progression of AMD and visual function deterioration were halted.

Effect of Visual Sensory Improvement by Amblyopia Treatment on Improvement of Ocular Functions (약시 치료에 의한 시감각 개선이 안기능 향상에 미치는 효과)

  • Kim, Jae-Do
    • Journal of Korean Ophthalmic Optics Society
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    • v.19 no.4
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    • pp.551-555
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    • 2014
  • Purpose: This study is to investigate if the improvement of visual sensory (VS) by amblyopia treatment affects the ocular functions in refractive errors, accommodative errors and phoria at distance and near. Methods: 10 subjects (17 eyes, mean age of $10.7{\pm}2.9$ years) who treated amblyopia completely, were participated for this study. Refractive errors, accommodative errors, and distance and near phoria were compared between before and after treatments of amblyopia. Refractive errors and accommodative errors at 40 cm were measured using openfield auto-refractor (NVision-5001, Shin Nippon, Japan) and using monocular estimated method (MEM) respectively. Phoria was determined at 3 m for distance and at 40 cm for near using Howell phoria card, cover test or Maddox rod. Results: Mean corrected visual acuity (CVA) significantly increased from $0.46{\pm}0.11$ (decimal notation) for before amblyopia treatment to a level of $1.03{\pm}0.13$ for after amblyopia treatment (p < 0.001). For spherical refractive error, hyperopia significantly decreased from $+2.29{\pm}0.86D$ to a level of $+1.1{\pm}2.38D$ (p < 0.05) but astigmatism did not significantly change; $-1.80{\pm}1.41D$ for before treatment and $-1.65{\pm}1.30D$D for after treatment (p > 0.05). Accommodative error significantly decreased from accommodative lag of $+1.1{\pm}0.75D$ to a level of $+0.5{\pm}0.59D$ (accommodative lag) (p < 0.05). Distance phoria significantly changed from eso $2.9{\pm}6.17PD$ (prism diopters) to a level of eso $0.2{\pm}3.49PD$ (p < 0.05), and near phoria also significantly changed from eso $0.4{\pm}2.32PD$ to level of exo $2{\pm}4.9PD$ (p < 0.05). There was a high correlation (r = 0.88, p < 0.001) between improvement of visual acuity and decrease of accommodative lag. Conclusions: Hyperopic refractive error decreased with improvement of CVA or VS by amblyopia treatment. And the improvement of VS by amblyopia treatment also improved accommodative error, and changed phoria coupled with accommodation.

Contact lens Prescription and Satisfaction with Astigmatism Eye (난시안의 콘택트렌즈 처방과 만족도에 관한 연구)

  • Kim, Mi-Yeon;Kim, Yeong-Mi;Kim, Tae-Hun;Sung, A-Young
    • Journal of Korean Ophthalmic Optics Society
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    • v.11 no.4
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    • pp.317-322
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    • 2006
  • For this study we made up a question investigation to analyze a grade of satisfaction and a side effect about the prescription actual condition of contact lens of person with astigmatism among the person who has a error of refraction. The whole patient of refractive error was 46 person, there were 11 person who only wear spectacles by correction of visual acuity among person to a question investigation and 35 person who only wear contact lens. Under investigation 35 person who only wear contact lens, there were 25 person who experience the problem which occurs because of contact lens wearing for a long time. The most patient who made up a question investigation very choose remainder item except for item of very satisfaction. The their reason that could not satisfaction was non corrected astigmatism, wrong prescription, wrong Base curve, out of life span etc.

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The Study on The Property of the Phoria and Asthenopia Inducing Factor in Adults in Jeon-Buk Area (전북지역 성인의 사위특성과 안정피로 유발인자에 관한 연구)

  • Oh, Hyun-Jin;Doo, Ha-Young;Oh, Seung-Jin
    • Journal of Convergence for Information Technology
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    • v.8 no.6
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    • pp.101-106
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    • 2018
  • We examined refractive error, the corrected visual acuity, phoria and fusional reserve of 114 healthy myopes and hyperopia who had no strabismus, no ocular and physical diseases. We evaluated the occurrence of asthenopia according to phoria and fusional reserve. 41 out of 114 subjects which exophoria was 69% and esophoria was 5.5%, orthophoria was 26% made a complaint against asthenopia. The subjects who had exophoria of $0-6{\Delta}$ in the range of normal state was 61.4%, while the subjects who had exophoria of $7{\Delta}$ or more in the range of abnormal state was 38.6%. Reducing fusional reserve was associated with increasing phoria. The fusional reserve twice or more than phoria were 27.2%, and twice or under were 72.8%. Futhermore, AC/A ratio for heterophoria was found from 1.0 to 12.6 and its relationship to asthenopia of phoria could not be determined.

A Study on the Physical Growth and Health Status in University Students (일부(一部) 대학생(大學生) 신체발육(身體發育) 및 건강상태(健康狀態)에 관(關)한 조사(調査))

  • Kwon, E-Hyock;Cha, Chul-Hwan
    • Journal of Preventive Medicine and Public Health
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    • v.1 no.1
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    • pp.67-78
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    • 1968
  • For the purpose of ascertaining the status of physical growth and health status of the University students, a intensive survey was conducted by the authors towards a total of 2,638(male; 2,228, female; 410) who passed the written entrance examination at the Seoul National University. The items included the measurements on physical growth, various physical indixes, visual acuity, tuberculosis and dental status. The findings and results can be summarized as follows: 1. Physical Growth No significant difference was found in the physical growth between classes(literature and science) and by ages. In males, the means of body height, body weight, chest-girth and sittingheight were $168.0{\pm}5.07cm,\;55.7{\pm}5.71kg,\;85.8{\pm}4.4cm\;and\;91.5{\pm}2.21cm$, respectively. In females, these were $157.4{\pm}4.57\;cm,\;00.4{\pm}5.75kg,\;80.3{\pm}4.51cm\;and\;86.1{\pm}3.30cm$, respectively. Basing on the above measurements several physical indixes were calculated as follows ; Relative body weight 33.15 in males and 32.02 in females. Relative chest-girth 51.07 and 51.01, relative sitting-height 54.46 and 54.70 $R\ddot{o}hrer$ index 1.00 and 1.02, Kaup index 1.97 and 2.04, Vervaeck index 83.63 and 83.03, and Pelidisi index 89.94 and 92.45. 2. Visual Acuity Among the students of science classes those of 0.8 and below in vision on left and right occupied 46.4% and 45.0%, those of 0.6 and below 39.1% and 41.2%, respectively. Among the students of literature classes those of 0.8 and below occupied 46.3% and 42.9%, and those of 0.6 and below occupied 41.4% and 39.0, respectively. In males those of 0.8 and below occupied 46.8% and 44.5% and 0.6 and below occupied 41.9% and 39.7%, while in females 0.8 and below occupied 43.9%, and 42.4%, and 0.6 and below occupied 38.3% and 37.3%, respectively. In males those of 0.8 and below in corrected vision occupied 12.1% and 10.3%, while in females 12.9% and 12.2%, respectively. More students of abnormal vision were found among science classes and the proportions of corrected vision were 38.9% and 37.4% in males, and 33.9% and 33.2% in females, respectively. 3. Tuberculosis Among the total, 55 students were diagnosed as tuberculosis, of whom 50 were minimal cases, 2 were moderately advanced cases and 3 were far advanced cases. 4. Dental Status Among the total, 81.2% were of decayed teeth, 20.8% filled, 9.5% missed, 5.0% extraction needed, 9.1% sunplatinum bridges, 3.3% golden bridges and 5.5% golden inlay. Regarding tartar on teeth moderate, heavy and light grades occupied 49.5%, 29.7% and 20.3%, respectively and 0.8% had none. 5. Comprehensive evaluation According to criteria 4 grades were applied to comprehensive evaluation as follows : A...excellent in physical status B...with some physical defects but no difficulties in study C...need treatment D...need treatiment and rest Out of the total, A grade occupied 21.6%, B 76.2% and C. and D 2.2.

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Comparison of Contrast Sensitivity at Near Between Functional Progressive Addition Lenses and Sigle Vision Lenses (기능성 누진가입도렌즈와 단초점렌즈의 근거리 대비감도 비교)

  • Kim, Chang-Jin;Kim, Hyun Jung;Kim, Jai Min
    • Journal of Korean Ophthalmic Optics Society
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    • v.15 no.4
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    • pp.381-388
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    • 2010
  • Purpose: This study was to compare the contrast sensitivity evaluated the visual ability at near wearing functional lenses for pre-presbyopes altered their single vision lenses to functional progressive addition lenses with low addition for 2 months. Methods: Healthy 32 subjects aged 24.03${\pm}$1.87 (male 23, female 9) who were recruited from university students wore functional progressive addition lenses(EYE-T, Chemilens Co., Korea, ADD 0.75D) for 2 months. Corrected visual acuity at distance and near and contrast sensitivity at near were tested right after wearing functional progressive addition lenses to compare wearing single vision lenses. And we had second test after 2 months later. Results: Comparing between test and retest, contrast sensitivity at near wearing functional progressive addition lenses was improved more than wearing single vision lenses at all spatial frequency of right, left and both eyes. Conclusions: There was considered that contrast sensitivity test is useful to evaluate the visual ability as well as quality of near work and can be applied variously.