NOCE Study Guide 2026
Everything you need to pass the NOCE exam in one place: the exam format, every topic to study, real practice questions with explanations, flashcards, and full-length practice tests. Free, no sign-up needed.
📋 NOCE Exam Format at a Glance
📚 NOCE Topics to Study (15)
✍️ Sample NOCE Questions & Answers
1. Which contact lens care concern has been associated with certain multipurpose solutions and silicone hydrogel lens materials?
Certain preservatives (such as PHMB) in some multipurpose solutions can interact with silicone hydrogel lens surfaces, leading to decreased wettability and increased discomfort.
2. What does 'limbal clearance' refer to in the context of contact lens fitting?
Limbal clearance is the space between the edge of a contact lens and the corneal limbus (corneoscleral junction), which is important for limbal vessel health and comfort.
3. When fitting a toric soft contact lens, which factor is MOST critical for achieving adequate visual correction?
Proper axis alignment is critical for toric lenses because mislocation of even a few degrees from the intended axis can significantly reduce the cylinder correction.
4. A patient reports seeing color fringes around objects, especially in their peripheral vision. This phenomenon is most likely caused by which lens aberration?
Chromatic aberration occurs because lens materials refract different wavelengths (colors) of light at slightly different angles, causing them to focus at different points. This dispersion of light results in color fringing, which is most noticeable in higher power lenses and when looking through the periphery. It is directly related to the Abbe value of the lens material.
5. In a myopic eye, parallel light rays from a distant object come to a focus:
Myopia, or nearsightedness, occurs when the eyeball is too long or the cornea has too much curvature. This causes parallel light rays from distant objects to converge and focus at a point in front of the retina, resulting in blurry distance vision.
6. What is the purpose of performing an 'over-refraction' during a contact lens fitting?
Over-refraction is performed with the trial contact lens in situ to determine what additional power is needed to achieve best corrected acuity with that specific lens.