tear prism height test|Clinical application of the tear film prism : companies 1. The correct answer is D. These methods all assess tear quantity but measuring tear meniscus height is a non-invasive test and the recommended technique. 2. The correct answer is A. A tear meniscus height of less than 0.1mm is considered low and indicates reduced tear quantity. 3. Find autoclavable-vials and related products for scientific research at Merck