The Oculus Keratograph Topographer provides an in-depth qualitative and quantitative analysis of the tear film on the corneal surface.
In addition, the Meibomian glands of the upper and lower lids can be imaged 3-dimensionally. These glands secrete oil which covers the tear film, helping to prevent evaporation. If these glands are absent in the upper or lower lids, parts of the tear film may not be adequately covered, resulting in evaporation and decreased tear break up times. See the image at bottom.
In the image below, the patient is instructed to blink several times, then keep the eye open as long as possible. The Oculus constantly analyzes the tear film, and records tear break up times by region as shown in the diagram on the right. Lasik patients generally have reduced tear break up times, indicating neuropathic damage..