NCLE Preparation Exam Part 2 of 4 with Complete Solutions!

Fluorescein is a valuable tool in evaluating the lens to cornea relationship of a rigid gas permeable lens. A special type of fluorescein (fluorosoft) should be used to evaluate the fitting relationship of a soft contact lens. If the diagnostic rigid gas permeable lens placed on the eye results in minimal movement, which of the following will increase the movement on the lens ordered for the patient? A. Decreasing overall lens diameter B. Increasing overall diameter C. Increasing optic zone diameter D. Increasing sagittal depth - ANSWER-A. Decreasing the overall lens diameter will loosen the fit and increase the movement of a lens. Increasing the overall diameter, increasing the optic zone diameter as well increasing the sagittal depth will all decrease the movement of rigid gas permeable lens. If a contact lens decenter laterally, exposing a portion of the patient's limbus, what change in parameter would improve this situation? A. Decreasing lens diameter B. Increasing lens diameter C. Flattening the base curve D. Increasing the center thickness - ANSWER-B.