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Comparison of visual acuities at different distances and defocus curves.

Abstract：

PURPOSE:To evaluate how visual acuities at different distances correlate with results from defocus curves. SETTING:Department of Ophthalmology and Institute of Medical Physics, University of Vienna, Medical School, Vienna, and Department of Ophthalmology, Krankenhaus St. Pölten, St. Pölten, Austria. METHODS:This study comprised 15 eyes of 14 patients with a mean age of 67.9 years +/- 9.7 (SD) with a monofocal silicone intraocular lens (911A, Pharmacia). The best corrected distance visual acuity was determined at viewing distances of 6 m, 2 m, 1 m, 67 cm, 50 cm, 40 cm, and 33 cm using logMAR charts. Defocus curves were then evaluated from -3.0 to -0.5 diopter (D) at 0.5 D increments from the best distance correction at a viewing distance of 6 m. RESULTS:The mean distance visual acuity was logMAR 0.08 +/- 0.07. The visual acuity graph from the testing at different distances was above the defocus graph at all testing points. Comparison of the visual acuity results from the 2 tests revealed statistically significant differences in the range from 2 m (-0.5 D) to 33 cm (-3.0 D). CONCLUSIONS:Results of defocus curves disregard the diminutions of minus glasses, the normally restricted viewing distance to 6 m for distance acuity determination, and in particular the physiological miosis caused by the near-point reaction.

journal_name

J Cataract Refract Surg

journal_title

Journal of cataract and refractive surgery

authors

Pieh S,Kellner C,Hanselmayer G,Lackner B,Schmidinger G,Walkow T,Sticker M,Weghaupt H,Fercher AF,Skorpik C

doi

10.1016/s0886-3350(02)01317-2

subject

Has Abstract

pub_date

2002-11-01 00:00:00

pages

1964-7

issue

11

eissn

0886-3350

issn

1873-4502

pii

S0886335002013172

journal_volume

28

pub_type

杂志文章

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