General instructions for Pachymetry

Quick and painless test that uses ultrasound or light to accurately measure the thickness of the cornea.

  • Definition: A quick and painless test that uses ultrasound or light to precisely measure the thickness of the cornea.
  • Fasting: No fasting necessary. You can eat your usual food and drink water or liquids normally before coming to your appointment.
  • Medication: You should maintain and take your usual medication at the appropriate times, including any eye drops you use. As always, any adjustment in your treatments or doubts about your medication should be discussed beforehand with your doctor.
  • Clothing and Accessories: You can wear the clothes you feel most comfortable in. There is absolutely no restriction on metals, jewelry, piercings, or watches for this exam.
  • Specific Requirements: If you use contact lenses, the specialist will ask you to remove them before starting, so we suggest taking your case and liquid, or coming directly with your glasses. Depending on the machine used at the center, the doctor may need to apply a small drop of local anesthetic to the eye just before the measurement.
  • Expected discomfort or pain from the test: It is a completely safe, very quick procedure and causes no pain. If the machine is optical (using light), there will be no physical contact with your eye. If it is done via ultrasound, the doctor will very gently touch the surface of your eye with a small probe (similar to a pen), but since your eye will be anesthetized, you will not feel pain, just very light pressure. The anesthetic drops may cause a very slight sting that disappears in a couple of seconds.