AIM: To determine the association of spherical equivalent (SE) with low uncorrected visual acuity (VA) along with a proposed definition for myopia using logMAR VA >0.3 as the criteria. METHODS: 1334 Chinese schoolchildren (mean age 7.8; range 7-9 years) were enrolled in the study after those who had hyperopia > or =+2.00 dioptres (D) and astigmatism > = -2.00 D were excluded. Uncorrected logMAR VA was measured for both eyes. Cycloplegia autorefraction was achieved by the instillation of three drops of 1% cyclopentolate 5 minutes apart. The average of five successful consecutive refraction and keratometry readings were obtained with calibrated Canon RK5 autokeratorefractometers by well trained optometry students, at least 30 minutes after the instillation of the third drop of cyclopentolate. SE cut-off points (-0.25 D, -0.5D, -0.75 D, -1.0 D) were evaluated. RESULTS: Using different SE cut-off points, the myopia prevalence rates of this sample of schoolchildren varied from 45.8% (SE at least -0.25 D) to 30.7% (SE at least -1.0 D). The cut-off point of > or =-0.75 D had a sensitivity and specificity of 91.8% (95% CI, 89.2 to 94.4) and 93.7% (95% CI, 92.1 to 95.3), respectively, to predict low vision defined as uncorrected logMAR VA > 0.3 (either eye). The next best cut-off point of -0.5D had a higher sensitivity (93.3%), but lower specificity (87.9%). CONCLUSIONS: The cut-off points of -0.75D and -0.5D in SE refraction are appropriate for the prediction of uncorrected logMAR VA worse than 0.3, which is the criterion for the US common state adult driver licensing standard.
AIM: To determine the association of spherical equivalent (SE) with low uncorrected visual acuity (VA) along with a proposed definition for myopia using logMAR VA >0.3 as the criteria. METHODS: 1334 Chinese schoolchildren (mean age 7.8; range 7-9 years) were enrolled in the study after those who had hyperopia > or =+2.00 dioptres (D) and astigmatism > = -2.00 D were excluded. Uncorrected logMAR VA was measured for both eyes. Cycloplegia autorefraction was achieved by the instillation of three drops of 1% cyclopentolate 5 minutes apart. The average of five successful consecutive refraction and keratometry readings were obtained with calibrated Canon RK5 autokeratorefractometers by well trained optometry students, at least 30 minutes after the instillation of the third drop of cyclopentolate. SE cut-off points (-0.25 D, -0.5D, -0.75 D, -1.0 D) were evaluated. RESULTS: Using different SE cut-off points, the myopia prevalence rates of this sample of schoolchildren varied from 45.8% (SE at least -0.25 D) to 30.7% (SE at least -1.0 D). The cut-off point of > or =-0.75 D had a sensitivity and specificity of 91.8% (95% CI, 89.2 to 94.4) and 93.7% (95% CI, 92.1 to 95.3), respectively, to predict low vision defined as uncorrected logMAR VA > 0.3 (either eye). The next best cut-off point of -0.5D had a higher sensitivity (93.3%), but lower specificity (87.9%). CONCLUSIONS: The cut-off points of -0.75D and -0.5D in SE refraction are appropriate for the prediction of uncorrected logMAR VA worse than 0.3, which is the criterion for the US common state adult driver licensing standard.
Authors: T Aung; P J Foster; S K Seah; S P Chan; W K Lim; H M Wu; A T Lim; L L Lee; S J Chew Journal: Ophthalmology Date: 2001-02 Impact factor: 12.079
Authors: Christine Younan; Paul Mitchell; Robert G Cumming; Elena Rochtchina; Jie Jin Wang Journal: Invest Ophthalmol Vis Sci Date: 2002-12 Impact factor: 4.799
Authors: G V S Murthy; Sanjeev K Gupta; Leon B Ellwein; Sergio R Muñoz; Gopal P Pokharel; Lalit Sanga; Damodar Bachani Journal: Invest Ophthalmol Vis Sci Date: 2002-03 Impact factor: 4.799
Authors: Robert N Kleinstein; Lisa A Jones; Sandral Hullett; Soonsi Kwon; Robert J Lee; Nina E Friedman; Ruth E Manny; Donald O Mutti; Julie A Yu; Karla Zadnik Journal: Arch Ophthalmol Date: 2003-08
Authors: David B Rein; John S Wittenborn; Xinzhi Zhang; Benjamin A Allaire; Michael S Song; Ronald Klein; Jinan B Saaddine Journal: Health Serv Res Date: 2011-04-14 Impact factor: 3.402
Authors: Joseph Ho; Dinorah P E Castro; Leonardo C Castro; Yueli Chen; Jonathan Liu; Cynthia Mattox; Chandrasekharan Krishnan; James G Fujimoto; Joel S Schuman; Jay S Duker Journal: Invest Ophthalmol Vis Sci Date: 2010-02-24 Impact factor: 4.799
Authors: David B Rein; John S Wittenborn; Xinzhi Zhang; Thomas J Hoerger; Ping Zhang; Barbara Eden Kobrin Klein; Kris E Lee; Ronald Klein; Jinan B Saaddine Journal: Arch Ophthalmol Date: 2012-05
Authors: Jun S Lai; Vaishnavi O Veetil; Carla Lanca; Bee Lan Lee; Keith M Godfrey; Peter D Gluckman; Lynette P Shek; Fabian Yap; Kok Hian Tan; Yap Seng Chong; Choon Nam Ong; Cheryl S Ngo; Seang-Mei Saw; Mary F F Chong Journal: Nutrients Date: 2020-01-21 Impact factor: 5.717