Lens performance became lower as we look away from the optical centre. This is the result of Oblique Aberrations appears when light refracted obliquely, which happens whenever we look in normal lens edge directions.
Those unwanted rays do not focus on the retina. Oblique aberrations reduce the quality of vision outside centre of the lens. For high prescription and wrap frames, the effect is even stronger.
Therefore, the modern free-form technology developed mathematics methods to calculate the optimized lens surface for everywhere. The backside of lens surface was well adjusted through such calculation till all lights focused on the retina correctly.
Oblique aberrations reduction
- Accurate prescription for every gaze direction thanks to the oblique aberrations reduction
- Excellent clarity also out of the optical centre.
- High resolution in the periphery of the lens.
The frame wrapping angle has above all influence on high wraparound frames.
Along with the pupillary distances and heights, the value of pantoscopic tilt is the most influential.
Tags: Optician Knowledge