What is the result of a larger optical zone in a tight fitting lens?

A larger optical zone in a tight-fitting lens leads to an increased sagittal depth. This is due to the fact that when the optical zone expands, the overall curvature of the lens typically increases, allowing for higher sagittal depth. The sagittal depth is the distance from the back surface of the lens to the refractive plane of the lens, and it plays a crucial role in how the lens fits on the cornea.

When the optical zone is larger, the lens often needs to accommodate increased thickness to maintain optical performance across that surface area. This adjustment can create a deeper fit on the eye, resulting in the increased sagittal depth measure.

While improved comfort might also be a consideration with a larger optical zone, it is not a direct result of the optical zone size itself, rather it depends on additional factors such as lens material and design. Therefore, the most accurate response concerning the relationship between a larger optical zone and lens fit is the increase in sagittal depth.