What two design changes might be helpful in centering a high riding myopic lens?

A high-riding myopic lens can often present challenges related to proper centering on the cornea due to its weight and geometry. Two effective design changes that can help improve the fit and encourage centering are the hyperflange lenticular design and prism ballast.

The hyperflange lenticular design features an increased edge thickness surrounding the central area of the lens, which optimally distributes weight. This distribution helps to stabilize the lens in place, reducing the tendency for the lens to ride higher than intended on the eye.

Prism ballast incorporates base-down prism, which serves to add weight to the lower portion of the lens. This added weight helps to pull the lens downward, effectively counteracting any upward movement that may occur due to the lens’ weight or the anatomical features of the wearer's eye.

Together, these design modifications create a more stable and centered fit for high-riding myopic lenses, making it easier for patients to achieve clear and comfortable vision. These design changes directly address the common issue of lens positioning in relation to the eye.