Adaptation to multifocal and monovision contact lens correction

Area of Science:

• Ophthalmology
• Optometry
• Vision Science

Background:

• Presbyopia affects near vision clarity, necessitating visual correction.
• Monovision (MV) and multifocal (MF) contact lenses are common correction methods.
• Comparing the visual performance of MF and MV lenses is crucial for patient care.

Purpose of the Study:

• To compare the visual performance of Biofinity multifocal (MF) contact lenses against monovision (MV) correction using Biofinity single-vision lenses.
• To evaluate visual acuity, contrast sensitivity, and stereoacuity in presbyopic patients.

Main Methods:

• A randomized crossover study involving 20 presbyopic patients.
• Each patient used MF and MV lenses for 15-day periods with a washout interval.
• Evaluated monocular and binocular visual acuity (VA) under high and low contrast, binocular contrast sensitivity, and near stereoacuity.

Main Results:

• No significant difference in binocular distance or near VA between MF and MV lenses.
• Significant improvement in monocular distance VA in the non-dominant eye with MF lenses (high and low contrast).
• Stereoacuity was significantly better with MF lenses compared to MV lenses (P < 0.01).

Conclusions:

• Multifocal contact lenses provide satisfactory visual acuity comparable to monovision.
• MF lenses did not compromise stereoacuity and showed potential for adaptation to multifocality over time.
• MF lenses demonstrated improved distance vision in the non-dominant eye and near vision in the dominant eye, unlike MV lenses.