Eagleview Eye Clinic

Archives February 2026

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.
BIFOCAL IOL

👓 Bifocal IOLs (Intraocular Lenses) are a type of lens implant used in cataract surgery to help restore vision at multiple distances. They’re designed to reduce dependence on glasses or contacts.

  • How they work: Bifocal IOLs have different zones for near and distance vision, allowing for clearer vision at multiple distances.
  • Types: Some common types include diffractive (e.g., Alcon ReSTOR) and refractive (e.g., AMO Array) lenses.
  • Benefits: Reduced need for glasses, improved vision at various distances.
  • Considerations: Potential for halos, glare, or decreased contrast sensitivity.

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