What does movement assessment in soft lens fitting indicate?

• A. Movement assessment ensures adequate tear exchange, comfort, and helps determine if the lens fits well.
• B. Movement has no relevance.
• C. Movement only affects aesthetics.
• D. Movement increases oxygen delivery.

Answer: (C)

Movement assessment in soft lens fitting is about how the lens sits and moves on the eye. It helps determine if the lens fits properly, allows enough tear exchange under the lens, and provides comfort and stability with blinking. If movement is too limited, the lens is likely too tight, restricting tear flow and increasing discomfort or potential hypoxia. If there is too much movement, the lens may be loose or unstable, leading to poor centration and irritation. The oxygen delivered to the cornea depends mainly on the lens material and thickness (Dk/t), not how much the lens moves. So movement assessment mainly indicates fit and tear exchange/comfort, rather than aesthetics or a direct increase in oxygen delivery.