• Title/Summary/Keyword: 시력교정

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Presbyopic Spectacle and Monovision for Reading Performance Before Adaptation (노안안경과 모노비젼 콘택트렌즈 착용 후 적응 전 읽기 능력 평가)

  • Chu, Byoung Sun;Hwang, Jeong Hee
    • Journal of Korean Ophthalmic Optics Society
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    • v.15 no.3
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    • pp.263-268
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    • 2010
  • Purpose: Eye movements and fixation ability are an important procedure to obtain external information and essential means of clear vision. The purpose of this study was to determine the reading performance such as reading time and number of fixations when random text was viewed at varying distances. Methods: Twenty two presbyopes were participated. All subjects were screened for their suitability to participate in the study by clinical examination, and none of the participants had previously worn contact lenses and no previous experience of wearing any types of presbyopic vision correction except single vision. The reading time and number of fixations were recorded using eye tracker while each subjects was waring four vision corrections which included single vision for distance (SV), bifocal spectacle lenses (BIF), progressive addition lenses (PAL), and monovision (MV). The reading material was presented at distance and near distance. Results: Reading time and number of fixations for near stimulus were significantly different among vision correction used in this study (p<0.001). In particular, wearing SV required longer reading time and produced longer fixation duration for near text. However, reading distance text was similarity performed across vision corrections tested and there was no statistical difference found for either reading time and number of fixations. Conclusions: Wearing presbyopic vision correction is advantageous for reading task of near stimuli, but not having near correction such as wearing SV could result in longer reading time and higher number of fixation due to lacks of accommodative ability for near task. For the future studies, it would be interesting to examine the performance of reading both at adapted and unadapted stages as examining only unadapted wearers was limitation of this study.

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.

Effects of Computer Pointing Game on Visual Perception Ability of Children with Intellectual Disability (컴퓨터 포인팅 게임이 지적장애아동의 시지각 능력에 미치는 효과)

  • Kim, Kyoung-Joo;Kim, Sung-Wan
    • Proceedings of the Korean Society of Computer Information Conference
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    • 2010.07a
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    • pp.449-452
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    • 2010
  • 이 연구는 컴퓨터 포인팅 게임이 중도(重度) 지적장애아동의 시지각 능력에 미치는 효과를 알아보는데 목적이 있다. 이를 위해, 시지각 능력에 효과적인 컴퓨터 포인팅 게임을 난이도 수준에 따라 3단계로 설계 및 개발하였다. 효과를 최대로 이끌기 위해, 1, 2주와 3주에 적용할 교수 학습 모형을 다르게 설계하였다. 그 효과를 알아보기 위해, 성남의 지적장애 H학교 초등부 재학생 중, 중도 지적장애아동이면서 낮은 시지각 능력을 보이지만, 교정시력과 손가락 사용에 어려움이 없는 4명의 아동을 대상으로 3주간 1회에 15분씩, 15회 실험을 실시하였다. 양적인 평가를 위해, 표준화 검사 도구인 한국판 시지각 발달검사(K-DTVP-2)를 4차에 걸쳐 진행하였고, 질적 평가를 위해, 관찰평가일지를 매주 실험이 끝난 후 작성하였다. 연구결과, 컴퓨터 포인팅 게임은 지적장애아동의 시지각 능력을 양적 질적 측면에서 향상시키는 것으로 나타났다.

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A Study on the Prescription of Size Lens for Myopic Aniseikonia (근시성 부등상시의 등상시 렌즈 처방에 관한 고찰)

  • Kwon, Young-Seok;Kim, Ki-Hong;Lee, Hyun-Mee;Chu, Byoung-Sun;Kwon, Yun-Kyung
    • Journal of Korean Ophthalmic Optics Society
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    • v.18 no.4
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    • pp.555-560
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    • 2013
  • Purpose: The aims of this study were to investigate the stereoacuity and subjective symptoms of aniseikonia with prescription of the size lens. Methods: Participants were myopic anisometropia patients with the binocular refraction difference between 1.75 D~3.50 D. Inclusion criteria of participants were no ocular pathology, no amblyopia, more than 1.0 of corrected visual acuity. With fully corrected spectacles and a correction with the size lens, Awaya aniseikonia test and Randot Stereo test were conducted respectively. In addition, subjective symptoms were also examined using questionnaire. Results: As the anisometropia increased, the aniseikonia increased. Under the anisometropia with same refractive correction was different for each individual. The prescription of size lens caused less aniseikonia than the general prescription of glasses. In addition, prescription of the size lens improved stereoacuity and relieved the symptoms of asthenopia. Conclusions: The prescription of size lens that can correct aniseikonia with prescription of glasses can improve stereoacuity and reduced asthenopia.

Change of Fixation Disparity and Accommodation when the Fusion Contrast Varied (융합대비에 따른 주시시차와 조절의 변화)

  • Seo, Jae-Myoung
    • Journal of Korean Ophthalmic Optics Society
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    • v.14 no.4
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    • pp.77-81
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    • 2009
  • Purpose: To study the change of fixation disparity and accommodation as fusion contrast is deteriorated. Methods: 16 subjects who had above 20/20 and stereopsis took part. Monocular and binocular refraction were done with Zeiss Polatest Classic whereas the critical angle for stereopsis was done with TNO. A computer programmed with Random-Dot stereogram and vernier test managed a precise change of the fusion contrast and exposure time. Results: The fixation disparity was influenced by reduction of fusion contrast and had tendancy to exophoria (p=0.0004), especially it is considerably higher when uncrossed disparity was shown to exophoric subjects. Although accommodation was not influenced by a change of fusion contrast (p=0.803), vernier acuity was influenced (p=0.0000). Conclusions: Exophoric trend arose as the fusion contrast was reduced, nevertheless there was no accommadative change.

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Visual Performances of the Corrected Navarro Accommodation-Dependent Finite Model Eye (안구의 굴절능 조절을 고려한 수정된 Navarro 정밀모형안의 시성능 분석)

  • Choi, Ka-Ul;Song, Seok-Ho;Kim, Sang-Gee
    • Korean Journal of Optics and Photonics
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    • v.18 no.5
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    • pp.337-344
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    • 2007
  • In recent years, there has been rapid progress in different areas of vision science, such as refractive surgical procedures, contact lenses and spectacles, and near vision. This progress requires a highly accurate modeling of optical performance of the human eyes in different accommodation states. A new novel model-eye was designed using the Navarro accommodation-dependent finite model eye. For each of the vergence distances, ocular wavefront error, accommodative response, and visual acuity were calculated. Using the new model eye ocular wavefront error, accommodation dative response, and visual acuity are calculated for six vergence stimuli, -0.17D, 1D, 2D, 3D, 4D and -5D. Also, $3^{rd}\;and\;4^{th}$ order aberrations, modulation transfer function, and visual acuity of the accommodation-dependent model eye were analyzed. These results are well-matched to anatomical, biometric, and optical realities. Our corrected accommodation-dependent model-eye may provide a more accurate way to evaluate optical transfer functions and optical performances of the human eye.

The differences of tear film for young Korean of a day indoor space (실내 공간 내에서 한국인 청년의 하루 중 눈물층 변화)

  • Oh, Hyun Jin;Lee, Ji-Young
    • Journal of Digital Convergence
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    • v.10 no.11
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    • pp.535-540
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    • 2012
  • This study is to research the differences of tear film for young people in of a day in a restricted indoor space. The subjects are 58 eyes volunteers for twice preliminary inspection and tear test of a day. 58 healthy individuals with no eye disease, no body disease, orthophoria, corrective visual acuity more than 0.8, binocular spherical equivalence difference over 0.50 diopter, the flattest corneal curvature in horizontal meridian and the steepest corneal curvature in vertical meridian were tested. The uncorrective visual acuity, refractive error, corneal curvature, schirmer test and tear break up test were performed in the morning and afternoon. Schirmer test were $16.0{\pm}7.0mm$ in the morning and $14.1{\pm}7.1mm$ in the afternoon. TBUT were $11.3{\pm}0.6$ sec in the morning and $12.1{\pm}0.9$ sec in the afternoon. They have no significant differences.

A Study of Ultrastructure on attachment of Soft Contact Lens Surface of Incubated Pseudomonas aeruginosa (배양된 Pseudomonas aeruginosa의 소프트 콘택트 렌즈 표면부착에 대한 미세구조적 연구)

  • Kim, Douk Hoon;Park, Yong Tae;You, Hae Byung
    • Journal of Korean Ophthalmic Optics Society
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    • v.5 no.2
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    • pp.11-14
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    • 2000
  • The soft contact lens was very simple technique in handling, good sensation in fitting, good effect of a beauty, and good attachment state on the cornea in physical movement. So that, the subjects have used the correct of visual acuity. If the contact lens handling have not skill, they have acquired the side effect on eye. To analysis of a study of ultrastructure on soft contact lens surface of incubated P. aeruginosa. We have observed the soft contact lens surface by SEM. We have founded the good technical method. On the method of sample process of manufacture, the best observation of samlpe tissue was $OsO_4$ postfixation and tannic acid treatment. In this case, P. aeruginosa was a rod shape and one cilia in ultrastructure and the identification was very good. But, On the process of manufacture have not used the $OsO_4$ and tannic acid treatment, this tissue sample appeared the foreign body materials and artifacts, and the identification of the P. aeruginosa was very difficult.

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A Comparison of Diclofenac versus Dexamethasone for the Treatment of Postcataract Inflammation

  • Lee, Suk Hyang;Suh, Ok Kyung;Jung, Hyun Ah;An, Gi Jung
    • Korean Journal of Clinical Pharmacy
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    • v.10 no.1
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    • pp.1-6
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    • 2000
  • 백내장 수술 추 염증치료를 위해 일반적으로 부작용이 많은 국소 점안 스테로이드를 사용해왔다. 최근 NSAID계열의 점안액이 항염증 치료약물로 개발되면서 선택적인 약물치료가 가능하게 되었으나 단일치료약물로 사용하는 경우는 드물다. 본 연구는 NSAID계 diclofenac 점안액의 백내장 수술 후 염증치료 효과를 스테로이드체 dexamethasone 점안액과 비교하여 단일 치료약물로서 사용할 수 있는 지 연구하고자하였다. 백내장 수술을 받은 환자로서 안압이 22 mmHg 이상 당뇨환자, 수술대상 눈에 이미 질환 및 수술 경력이 있는 자를 제외하였다. 백내장 수술 후 항염종 약물로서 diclofenac 또는 dexamethasone을 28일 동안 투여하고 항염증효과의 평가를 위하여 세극등 검사로저 전방내 염증세포와 결막, 각막등의 전안부 관찰을 수술 전, 수술 후 1, 3, 7, 14, 28일에 시행하였고, 시력검사는 수술 추 7, 28일에 시행하였다. 안전성의 평가는 안압검사와 세극등 검사상 관찰된 이상소견으로 평가하였다. 총 73명의 연구대상 중 dexameasone군은 41명, diclofenac군은 32명이며 두 군간에 나이, 백내장의 심한 정도, 안구질환 등에 있어 유의한 차이가 없었다 전방내 항염증세포수의 감소에서 두 군간에 유의할 만한 차이가 없었고, 수술 후 최대 교정 시력에서도 동일한 효과를 보였다. 안전성에서 안압의 상승이 두군간에 통계적인 유의한 차이를 보이지 않았으나 dexamethasone군에서 1명의 환자가 45 mmHg 이상 증가하여 약물치료가 필요하였으나 diclofenac군에서는 안압이 상승한 환자가 없었다. 결론적으로 효능 및 안전성에서 두 약물간에 통제적, 임상적으로 유의한 차이가 없었으며 diclofenac 점안액은 백내장 수술 후 항염증치료제로서 충분한 효과가 있으며 안압상승, 감염 등 부작용이 우려되는 dexamethasone점안액의 대체약물로 사용될 수 있을 것으로 평가된다.

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Clinical Efficacy of Bunny Multifocal Intraocular Lens after Cataract Surgery (버니 다초점인공수정체의 임상적 효용성)

  • Cho, Myung Ho;Park, Jae Yeong;Park, Byung Gun;Lee, Jong Soo
    • Journal of The Korean Ophthalmological Society
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    • v.59 no.12
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    • pp.1129-1136
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    • 2018
  • Purpose: To compare the postoperative clinical outcomes after cataract surgery and implantation using the BunnyLens $MF^{(R)}$ and $ReSTOR^{(R)}$ multifocal intraocular lenses. Methods: Sixty-five eyes implanted with multifocal intraocular lenses were divided into two groups involving either $ReSTOR^{(R)}$ (39 eyes) or BunnyLens $MF^{(R)}$ (26 eyes) lenses. In these two groups, the distant and near visual acuity, astigmatism, spherical equivalent, and contrast sensitivity test were examined at preoperative and postoperative 1 week, 8 weeks, and 24 weeks. We compared the clinical efficacy between the two groups before and after cataract surgery using statistical analysis. Results: The mean value of distant and near visual acuity, and spherical equivalent of both groups after intraocular lens implantation were significantly improved, compared with the preoperative values (p < 0.05), while there was no significant differences between the two groups (p > 0.05). The means of postoperative distant and near visual acuity, astigmatism, and contrast sensitivity test were not significantly different between $ReSTOR^{(R)}$ and BunnyLens $MF^{(R)}$ lenses (p > 0.05). The mean numeric error of spherical equivalent at the final postoperative 24 weeks was $-0.17{\pm}0.50$ diopters (D) for the $ReSTOR^{(R)}$ lenses and $-0.34{\pm}0.52D$ for the BunnyLens $MF^{(R)}$ lenses (p > 0.05). Conclusions: BunnyLens $MF^{(R)}$ and $ReSTOR^{(R)}$ lenses showed no significant difference in clinical efficacy, including distance and near vision, spherical equivalent error, and contrast sensitivity test after cataract surgery. However, it should be noted that BunnyLens $MF^{(R)}$ lenses had a tendency toward myopic shift compared with $ReSTOR^{(R)}$ lenses.