National Contact Lens Examiners (NCLE) Practice Exam 2025 - Free NCLE Practice Questions and Study Guide

Overnight orthokeratology primarily uses rigid gas permeable lenses. These lenses are specifically designed to reshape the cornea during sleep, allowing for temporary correction of myopia or other refractive errors. The material of rigid gas permeable lenses allows for adequate oxygen permeability while maintaining a shape that effectively flattens the corneal curvature overnight.

During the application of orthokeratology, these lenses are worn while the patient sleeps, and upon waking, the resulting corneal shape helps to provide clear vision throughout the day without the need for corrective lenses. The design and fit of these lenses are critical for achieving the desired therapeutic effect.

Although other types of lenses, such as soft daily disposables or hybrid lenses, are utilized for various vision correction needs, they do not provide the same level of corneal reshaping necessary for successful overnight orthokeratology. Colored contact lenses are primarily for cosmetic purposes and do not function as a means of refractive correction. Thus, rigid gas permeable lenses stand out as the optimal choice for this specific application.