Endothelial count is an ophthalmological test that analyses the cells of the corneal endothelium (the innermost layer of the cornea, the main function of which is to keep it dry). The test indicates the quantity (its number per square millimetre), shape and size.
The number of endothelial cells decreases with age, the normal quantity in adults ranging between 1500 and 2500 per mm2. When this quantity is below 600-500, the cornea accumulates aqueous humour inside it and loses transparency.
It is important for the test to be performed before certain surgeries involving the cornea, and to monitor some diseases.
How is the endothelial count performed?
A specular or endothelial microscope is used to perform the test, which captures very precise images of the endothelial cells (number, size and shape).
The patient rests their chin and forehead on an appliance that takes the photographs.
4 keys to endothelial count
- It is a painless test.
- Pupil dilation is not necessary, but it can also be performed with the pupil dilated.
- No special prior patient preparation is required.
- Test duration 5-10 minutes per eye.
What diseases can be diagnosed?
Endothelial count is used for: