Placido's Disc

The hand held Placido Disc is the easiest and most practical device for assessing corneal topography.

It comprises a circular disc with a series of alternating black and white concentric rings with a central viewing lens.

The patient’s cornea is viewed through the lens with the rings facing the patient.

The rings are illuminated using a light situated behind and adjacent to the patient’s head.

The bright images of the rings visible to the observer through the central lens can be examined over an area of 4 to 6 mm in diameter.

Any eccentricities in these ring images is caused by irregularities in the topography of the cornea itself.

Commonly purchased with:

The Hiding Heidi Low Contrast Test – SDT-384-H

Lea Paediatric Acuity Test Puzzle – SGR-960-L

Lea Grating Paddles Set – SDT-956-L