Contrast sensitivity with contact lens corrections for presbyopia

Area of Science:

• Ophthalmology
• Optometry
• Vision Science

Background:

• Presbyopia affects near vision clarity with age.
• Multifocal corrections aim to restore functional vision at multiple distances.
• Contrast sensitivity is a key measure of visual function.

Purpose of the Study:

• To compare contrast sensitivity function (CSF) across various multifocal corrections for presbyopia.
• To evaluate the efficacy of spectacle versus contact lens corrections for presbyopia.

Main Methods:

• Contrast sensitivity was measured at 330 mm, 660 mm, and 4 m.
• Evaluated two spectacle corrections: D-segment bifocals and trifocals.
• Assessed six contact lens corrections: distance with lookover, soft progressive bifocals, soft concentric bifocals, monovision, modified monovision, and hard crescent segment bifocals.

Main Results:

• Spectacle corrections generally yielded superior contrast sensitivity compared to contact lens corrections.
• Distance contact lenses with lookover spectacles showed the best performance among tested contact lens options.
• Differences in CSF among the various contact lens corrections were minimal and not statistically significant.

Conclusions:

• Multifocal spectacles may offer advantages over contact lenses for maintaining contrast sensitivity in presbyopia.
• While distance contact lenses with lookover spectacles performed best in the contact lens group, overall performance differences were not statistically significant.
• Further research may be needed to optimize contact lens designs for presbyopia correction and contrast sensitivity.