Certified Ophthalmic Technician (COT) Practice Test 2025 - Free COT Practice Questions and Study Guide

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How many layers are there in the tear film?

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The tear film consists of three distinct layers that work together to provide optimal ocular surface health and comfort. The outer layer is a thin lipid layer secreted by the meibomian glands, which helps to prevent evaporation of the underlying aqueous layer. The middle layer, which is the thickest, is the aqueous layer produced by the lacrimal glands, providing moisture and essential nutrients to the cornea. Finally, the innermost layer is the mucin layer, secreted by goblet cells in the conjunctiva, which ensures that the tear film adheres to the ocular surface and provides stability.

Understanding the structure of the tear film is crucial for managing various ocular surface disorders, as imbalances in any of these layers can lead to conditions such as dry eye syndrome. The identification of these three layers underscores the complexity of the tear film and its vital role in maintaining eye health.

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