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Vision and task performance with monovision and diffractive bifocal contact lenses.
M G Harris1, J E Sheedy, C M Gan
1Morton D. Sarver Laboratory for Contact Lens and Corneal Research, School of Optometry, University of California, Berkeley.
Summary
Presbyopia correction using diffractive bifocal contact lenses (BFCL) and monovision contact lenses (MVCL) resulted in reduced visual acuity and task performance compared to distance contact lenses with reading spectacles. Most patients preferred MVCL over BFCL.
Area of Science:
- Ophthalmology
- Optometry
- Vision Science
Background:
- Presbyopia affects near vision in individuals over 40.
- Contact lens correction options include diffractive bifocal contact lenses (BFCL) and monovision contact lenses (MVCL).
- Evaluating visual function and patient preference is crucial for effective presbyopia management.
Purpose of the Study:
- To compare the vision and task performance of presbyopes using BFCL and MVCL.
- To assess patient preference between BFCL and MVCL correction methods.
Main Methods:
- 26 presbyopes (ages 46-65) participated in a 6-week study.
- Subjects were fitted with BFCL and MVCL for 3 weeks each.
- Distance contact lenses with reading spectacles (DCL) served as the control.
Main Results:
- Near task performance times were 6-8% longer with BFCL and 2-6% longer with MVCL compared to DCL.
- Distance visual acuity was reduced with both BFCL (0.4-1.5 lines) and MVCL (0.5-0.8 lines) versus DCL.
- 18 out of 20 subjects preferred MVCL over BFCL at study conclusion.
Conclusions:
- Both BFCL and MVCL lead to greater visual compromise and decreased task performance than DCL.
- MVCL demonstrated a significantly higher patient preference compared to BFCL for presbyopia correction.