[Bifocal contact lenses as a correction method in presbyopia].

Area of Science:

• Ophthalmology
• Optometry
• Vision Science

Background:

• Presbyopia, an age-related loss of accommodation, affects near vision.
• Bifocal contact lenses (BCL) offer a potential correction method.
• Spectacle correction remains a standard for refractive errors.

Purpose of the Study:

• To assess the efficiency of various bifocal contact lenses (BCL) for presbyopia correction.
• To compare BCL performance against maximal spectacle correction.
• To evaluate subjective patient data and functional visual parameters.

Main Methods:

• Comprehensive evaluation of subjective patient data.
• Measurement of functional visual quality parameters (far and near).
• Mono- and binocular measurements with various soft and rigid BCL compared to spectacles.

Main Results:

• Reduced contrast sensitivity was observed with Russian-made BCL (7%), Acuvue Bifocal BCL (12.5%), and the "mono-vision" system (13.4%).
• Visual working ability decreased with soft bifocal Russian-made BCL (13%), Acuvue Bifocal BCL (17.3%), and "mono-vision" (20.7%) versus spectacles.
• Stereoscopic vision indices reduced by 25% with the "mono-vision" system; dazzling sensitivity showed no reliable differences.

Conclusions:

• Bifocal contact lenses provide a viable option for presbyopia correction.
• Certain BCL designs and the "mono-vision" system may impact contrast sensitivity and visual working ability.
• Further research into optimizing BCL for visual performance is warranted.