Diagnosis and Tests

Optical biometry is the most important test for planning cataract surgery, measuring the physical dimensions of the eye to calculate the ideal IOL power. LIV Hospital uses devices like the IOLMaster or Lenstar, which use laser light to measure axial length and corneal curvature with precision to 0.01 millimeters. Complex formulas, such as the Barrett Universal II, predict the lens needed for optimal vision. Unlike older ultrasound A-Scans, optical biometry is non-contact, painless, and more accurate.

Corneal Topography

For patients with astigmatism, a 3D map of the cornea is essential. Topography projects rings onto the eye to analyze curvature, identify steep areas, and guide Toric lens alignment for precise astigmatism correction. Without this map, lens placement is only an estimate.

Optical Coherence Tomography (OCT)

OCT uses light waves to capture cross-sectional images of the retina, useful when dense cataracts block the view. It examines the macula for swelling, holes, or membranes, ensuring that premium lenses like multifocals will function properly.

Specular Microscopy

This test evaluates the cornea’s inner endothelial layer, which pumps water out to maintain clarity. Cell counts help assess risk, as cataract surgery can stress these cells. If the count is low, protective measures like viscoelastics are used to prevent corneal swelling.

Preparing for Measurements

Accurate readings require the cornea in its natural shape. Stop wearing soft contacts for one week and RGP lenses for two to three weeks before the exam. Use artificial tears to prevent dryness and bring your current glasses to compare vision changes.