Multiple choice

Which is the external most layer of the tear film that prevents tears from flowing over the edge of the lower eyelid?

  1. Lacrimal layer

  2. Aqueous layer

  3. Mucoid layer

  4. Mucin layer

  5. Lipid layer
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E Correct answer
Explanation

The external most layer of the tear film is the lipid or oil layer. This layer prevents the lacrimal layer beneath it from evaporating. It also prevents the tears from flowing over the edge of the lower eyelid.

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