Certified Ophthalmic Assistant Practice Exam

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Prepare for the Certified Ophthalmic Assistant Exam with flashcards and multiple-choice questions. Each question includes hints and explanations to enhance your understanding. Ace your exam with confidence!

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Which statement about tear film is true?

Tear film is only for lubrication
Tear film is essential for hydrating the ocular surface
Tear film does not influence vision
Tear film is produced only during crying

The correct answer is: Tear film is essential for hydrating the ocular surface

Tear film is essential for hydrating the ocular surface, which is critical for maintaining eye health and function. The tear film consists of several layers, including the lipid, aqueous, and mucin layers, each serving multiple roles. Among its key functions, tear film helps to keep the cornea moist, supports the immune response against pathogens, and provides essential nutrients to the avascular cornea. While lubrication is one of the roles of tear film, stating that it is "only for lubrication" overlooks its broader physiological importance. Tear film is constantly produced to maintain hydration even when a person is not crying, and it significantly contributes to visual clarity by providing a smooth optical surface. Thus, tear film does influence vision by ensuring that the surface of the eye remains healthy and clear, supporting optimal visual acuity. Lastly, tear production does not occur exclusively during crying; it is naturally secreted during various activities, including blinking, to continuously hydrate and protect the eyes.