What change should be made to increase lens movement on a contact lens?

To increase lens movement on a contact lens, widening the peripheral curves is the most effective approach. When the peripheral curves of a lens are adjusted to be wider, it decreases the overall relationship between the lens and the surface of the cornea. This allows for more space between the lens and the eye, facilitating greater movement during blinking and eye activities. Increased lens movement can improve comfort and may also assist in tear exchange underneath the lens, which is crucial for keeping the eye hydrated and healthy.

Widening the peripheral curves also can help in accommodating variations in eye shape and can be particularly beneficial for patients with more prominent palpebral fissures or higher levels of blink activity. When the lens has more freedom to move, it can adjust better to the natural movements of the eye.

On the other hand, narrowing the peripheral curves can restrict movement, as the lens would sit more closely to the cornea, potentially leading to discomfort and reducing tear flow under the lens. Increasing lens thickness would also hinder movement, as a thicker lens does not flex or shift as easily on the corneal surface. Decreasing the diameter of the lens can reduce the area of contact with the eye, which may not necessarily enhance movement but might not provide the stability required for overall lens