The D.O.R.C. Advantage: Disposable Ophthalmic Instruments | OphthalmologyWeb: The Ultimate Online Resource for Ophthalmologists

Which of the following is true?
1. The aqueous layer of the tear film is the thickest layer.
2. The lipid layer of the tear film is produced by the conjunctival goblet cells.
3. The mucin layer is secreted by the glands of Wolfring.
4. There are 4 layers of the tear film.
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