Foveal vision power errors induced by spectacle lenses designed to correct peripheral refractive errors

Area of Science:

• Ophthalmology
• Optometry
• Optical Engineering

Background:

• Conventional spectacles can induce peripheral hyperopic defocus.
• Radial Refractive Gradient (RRG) spectacles are designed to counteract this defocus.

Purpose of the Study:

• To demonstrate a method for designing RRG spectacles.
• To quantify the foveal vision power errors induced by these lenses.

Main Methods:

• A sequential surface construction algorithm was used to design RRG lenses with front aspheric surfaces.
• A peripheral refraction model was developed based on average refractive errors.
• Four negative lenses (-2.5 to -10.0 D) were designed to match retinal conjugate surfaces.

Main Results:

• RRG lenses significantly reduce sagittal power errors across wide off-axis angles.
• Non-negligible mean power errors (above 0.25 D) were observed for foveal vision in a rotating eye.

Conclusions:

• RRG spectacles introduce unavoidable power errors for dynamic foveal vision.
• The design method provides insights for balancing peripheral and foveal vision correction.