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Monovision contact lens wear and occupational task performance
J E Sheedy1, M G Harris, L Busby
1School of Optometry, University of California, Berkeley.
American Journal of Optometry and Physiological Optics
|January 1, 1988
Summary
Monovision (MV) contact lenses slightly reduced nearpoint task performance and increased errors compared to bifocal (BV) correction in presbyopic individuals. Further adaptation did not significantly improve MV performance over time.
Area of Science:
- Ophthalmology
- Optometry
- Vision Science
Background:
- Presbyopia affects near vision, necessitating corrective strategies.
- Monovision (MV) contact lenses offer a potential solution by correcting one eye for distance and the other for near vision.
Purpose of the Study:
- To evaluate the impact of monovision (MV) contact lens wear on occupational nearpoint task performance in presbyopic subjects.
- To compare MV performance against standard bifocal (BV) correction with reading glasses.
Main Methods:
- 18 presbyopic subjects (44-67 years) with good visual acuity and stereopsis participated.
- Performance on nearpoint tasks (pointers/straws, card filing, letter editing) was measured under MV and BV conditions.
- Measurements were taken at baseline, 2 weeks, and 8 weeks after MV lens dispensing.
Main Results:
- Bifocal (BV) correction demonstrated superior time performance (2.8-5.7% better) compared to monovision (MV).
- Monovision (MV) wear resulted in a higher number of errors across tasks.
- Performance differences between MV and BV did not significantly improve with 8 weeks of adaptation.
Conclusions:
- Monovision contact lenses may lead to reduced efficiency and increased errors in occupational nearpoint tasks for presbyopic individuals.
- Bifocal correction remains a more effective option for maintaining performance in these tasks.
- Further research may explore long-term adaptation or alternative MV strategies.