Diagnostics

Optical coherence tomography, OCT, is a noninvasive imaging technique that uses low coherence interferometry with near infrared li...

A visual field test, or perimetry, measures the extent and sensitivity of vision across the entire field, including peripheral vis...

Tonometry is the measurement of intraocular pressure, the fluid pressure inside the eye, and is a key part of assessing glaucoma r...

A dilated eye examination is an eye examination performed after eye drops have widened the pupils, allowing a much more complete v...

Visual acuity is a measure of the ability of the eye to resolve fine detail and is the most commonly used measure of visual functi...

An autorefractor is a computer controlled instrument that objectively measures the refractive error of the eye, estimating the sph...

The Amsler grid is a square grid of evenly spaced horizontal and vertical lines with a central fixation dot, used to test the cent...

Fluorescein angiography is a retinal imaging test in which fluorescein dye is injected into a vein in the arm and a special camera...

Corneal topography produces a color coded map of the curvature of the cornea, much like a contour map of terrain. Placido disc sys...

Gonioscopy is an examination of the anterior chamber angle, where the iris meets the cornea and where the trabecular meshwork drai...

Electroretinography, ERG, records the electrical signals generated by the retina in response to flashes of light, using electrodes...

The Ishihara test is a set of plates covered in dots of varying color and size, arranged so that a number or path is visible to pe...

The slit lamp, or biomicroscope, combines a binocular microscope with a bright, adjustable light source that can be narrowed to a ...