Which glands produce the watery layer of tear film in conjunction with the lacrimal gland?

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Prepare for the Certified Paraoptometric Assistant (CPOA) Exam. Study with extensive flashcards and multiple choice questions with explanations. Enhance your skills and knowledge to succeed.

Multiple Choice

Which glands produce the watery layer of tear film in conjunction with the lacrimal gland?

Explanation:
The watery (aqueous) layer of the tear film is produced primarily by the lacrimal gland, but it is supplemented by the accessory lacrimal glands—the glands of Krause and Wolfring. The Krause glands are located in the conjunctival fornix, while the Wolfring glands are in the upper eyelid’s tarsal conjunctiva; together they secrete additional aqueous tears that mix with the lacrimal fluid to form the tear film. Goblet cells produce mucin for the innermost mucous layer, and the glands of Zeis are sebaceous glands for eyelash lubrication, not contributors to the aqueous tear layer.

The watery (aqueous) layer of the tear film is produced primarily by the lacrimal gland, but it is supplemented by the accessory lacrimal glands—the glands of Krause and Wolfring. The Krause glands are located in the conjunctival fornix, while the Wolfring glands are in the upper eyelid’s tarsal conjunctiva; together they secrete additional aqueous tears that mix with the lacrimal fluid to form the tear film. Goblet cells produce mucin for the innermost mucous layer, and the glands of Zeis are sebaceous glands for eyelash lubrication, not contributors to the aqueous tear layer.

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