American Board of Opticianry (ABO) Practice Test 2026 - Free ABO Practice Questions and Study Guide

When a minus lens is moved further away from the eye, the effect on the perceived strength of the lens is such that more minus power is required to achieve the same visual correction. This is due to the principles of optics and how the position of the lens relative to the eye affects the focal point.

As the minus lens is moved further away, the virtual image it creates also moves further back, which can result in the image appearing smaller. To compensate for this change in distance and ensure that the image is focused correctly onto the retina, additional minus power needs to be added. Thus, the lens power effectively needs to become stronger to counteract the increased distance and provide clear vision for the observer.

In the context of this question, the correct answer reflects the necessary adjustment in lens power to maintain optimal vision as the lens position is altered relative to the eye.