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Keratometry

Eye Care estimated about CNY 100-250

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Description

A clinical procedure that measures the curvature of the anterior surface of the cornea to assess refractive power and detect astigmatism, typically using a keratometer.

Main Uses

Primary uses include preoperative assessment for cataract surgery (IOL power calculation), fitting of contact lenses (especially rigid gas-permeable and scleral lenses), diagnosis and monitoring of corneal ectatic disorders (e.g., keratoconus), evaluation of corneal astigmatism, and detection of corneal irregularities following trauma or surgery.

Normal Range

Corneal curvature is typically measured in diopters (D) or millimeters (mm) of radius of curvature. Average keratometry values: 43.0–45.0 D (or 7.6–8.0 mm radius); with astigmatism < 1.0 D considered normal. Steep meridian usually 43–45 D, flat meridian 42–44 D; difference (astigmatism) ≤ 1.25 D is typical in healthy eyes.

Low Values - Possible Causes

Keratoconus (early stage with paradoxical flattening), corneal edema (e.g., Fuchs’ dystrophy), post-penetrating keratoplasty flattening, chronic contact lens-induced corneal warpage (especially rigid lenses), and advanced bullous keratopathy.

High Values - Possible Causes

Keratoconus (progressive steepening), pellucid marginal degeneration, post-refractive surgery ectasia (e.g., LASIK complications), acute corneal hydrops, and congenital corneal steepening (e.g., megalocornea or microcornea variants).

corneal curvature measurement keratometry corneal topography astigmatism assessment IOL power calculation

estimated about CNY 100-250