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Quantification of accommodative response and visual performance in non-presbyopes wearing low-add contact lenses.
- Source :
-
Contact Lens & Anterior Eye . Jun2020, Vol. 43 Issue 3, p226-231. 6p. - Publication Year :
- 2020
-
Abstract
- <bold>Purpose: </bold>Digital eye strain encompasses a range of ocular and visual symptoms across all age groups. Recently, symptoms associated with accommodative or binocular vision stress have become a major problem, especially in young individuals. The purpose of this prospective, single-blinded study was to objectively quantify the accommodative response and visual performance of low-add soft contact lenses (CLs) in young non-presbyopic individuals.<bold>Methods: </bold>A daily disposable low-add bifocal design lens (low-add CL) was tested. It employs a centre-distance optical zone and peripheral zone with the added power of +0.50 D to support near vision. Sixteen subjects aged 20-39 years were enrolled in the study. Refractive state and accommodation were measured using an open-field autorefractor with three target vergences, namely, -0.20 D, -2.5 D, and -4.0 D. Binocular visual acuity at high (100%) and low (40%, 20%) contrast and reading ability were assessed. Monofocal soft CLs were used as controls.<bold>Results: </bold>Accommodative response with low-add CLs was significantly smaller than those with two monofocal CL wearing conditions, i.e., at 40 cm (2.5 D of stimulus) and 25 cm (4.0 D of stimulus) (all p < 0.05). The 20% contrast visual acuity at distance was significantly better with low-add CLs and second-time monofocal CLs compared to first-time monofocal CLs (all p < 0.05). The reading ability was not significantly different.<bold>Conclusions: </bold>Quantification of accommodative response and visual performance demonstrated that using low-add CLs alleviated the accommodation under the near-vision condition, without sacrificing distance vision, in non-presbyopes. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 13670484
- Volume :
- 43
- Issue :
- 3
- Database :
- Academic Search Index
- Journal :
- Contact Lens & Anterior Eye
- Publication Type :
- Academic Journal
- Accession number :
- 143327249
- Full Text :
- https://doi.org/10.1016/j.clae.2019.07.004