Aspheric spectacles for correcting presbyopia with myopia and astigmatism

Area of Science:

• Ophthalmology
• Optical Engineering
• Vision Science

Background:

• Presbyopia, a common age-related condition, significantly impacts both far and near vision.
• Current spectacle designs often struggle to provide optimal optical performance across different visual distances.
• Understanding individual eye characteristics is crucial for personalized vision correction.

Purpose of the Study:

• To propose and validate a method for designing aspheric spectacles for presbyopia.
• To achieve good optical performance for both far and near vision with a single pair of spectacles.
• To optimize spectacle design considering individual eye metrics and visual demands.

Main Methods:

• Experimental measurement of wavefront aberrations and axial lengths in eight myopic eyes.
• Construction of individual eye models incorporating field of view (FOV), eyeball rotation, and residual accommodation.
• Optimization of spectacle-eye systems using Zemax simulations for visible wavelengths.
• Evaluation of image quality via modulation transfer function (MTF) and visual acuity (VA) at different pupil sizes (2, 2.8, 4 mm).

Main Results:

• Spectacles provided strong low-contrast transfer for far and near vision at 2-2.8 mm pupil sizes.
• Visual acuity reached 0.8 for all subjects, and up to 1.1 for some, at 0° FOV.
• At a 4 mm pupil size, VA remained good at 0.6 for the full FOV, confirming effectiveness for presbyopia.
• Visual continuity was verified for intermediate vision, validating the design method's accuracy.

Conclusions:

• The proposed method for designing aspheric spectacles is accurate and practicable for presbyopia.
• The designed spectacles effectively enhance visual resolution and contrast transfer for both far and near vision.
• This approach offers a viable solution for improving visual quality in presbyopic individuals.