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Corneal Pachymetry

What is Pachymetry?

Corneal Pachymetry is a test to measure the thickness of your cornea. The measurement is done in micrometers or microns.

Corneal Pachymetry is of two types:

a. Ultrasound: Here, an ultrasound probe is used.
b. Optical: Here, a small eye camera is used.

How is Pachymetry done?

For Ultrasound Pachymetry, your eyes are first numbed using topical anesthetic drops. The test is done by touching a small ultrasonic probe on your central cornea very lightly a few times. It takes about 5-10 minutes for both the eyes. The results can be known from the device immediately.

Why is Pachymetry done?

• Early detection of Glaucoma in combination with eye pressure measurement: If your corneal thickness is lesser than 555 microns, you have a 3 times greater risk for developing glaucoma than someone with 588 microns thickness.
• If your cornea is thin, it can lead to a falsely low reading of your eye pressure and a falsely high eye pressure reading in case of thick corneas. This is done to create a baseline guide for future measurements in patients of glaucoma or ocular hypertension.
• Before corneal surgeries like Limbal Relaxing Incisions for astigmatism, corneal transplantation
• Before lasik surgery to prevent ectasia or bulging of the thin cornea
• In the management of diseases like keratoconus, corneal dystrophy, corneal swelling, etc.