Eagleview Eye Clinic

Tag 20D Lens

GOLDMAN APPLANATION TONOMETER

👓 The Goldmann tonometer is a widely used device for measuring intraocular pressure (IOP).

  • How it works: Uses a small probe to gently touch the cornea, measuring the force needed to flatten a small area.
  • Gold standard: Considered the gold standard for IOP measurement.
  • Common use: Routine eye exams, glaucoma diagnosis, and monitoring.
  • Requires anesthetic: Typically uses topical anesthetic eye drops.

20D LENS

👓 Here’s more on a 20D lens:

  • Magnification: A +20D lens provides approximately 20x magnification.
  • Field of view: Offers a relatively wide field, useful for examining the retina.
  • Use: Commonly used in ophthalmology for:
    • Indirect ophthalmoscopy (with a slit lamp or head-mounted scope).
    • Examining the posterior segment (retina, macula, etc.).
  • Type: Typically a handheld, convex lens made of glass or acrylic.
  • Working distance: Around 5 cm (2 inches) from the patient’s eye.