What clinical test can be used to determine if there is adequate tear production?

The Schirmer test is specifically designed to evaluate tear production and assess the functionality of the lacrimal glands. During this test, small strips of filter paper are placed under the lower eyelids to absorb tears over a specified period. The amount of wetting of the paper is measured to determine whether the tear production is within a normal range.

Other clinical tests mentioned do not assess tear production directly. The slit lamp examination is primarily used to visualize the anterior segment of the eye and check for various ocular conditions. The visual acuity test measures how well a person can see at a given distance and is not related to tear production. The cover test is used to evaluate eye alignment and ocular motility but does not provide information about the production of tears. Therefore, the Schirmer test stands out as the appropriate method to determine adequate tear production.