Placido's Disc

Ophthalmic Procedures
Labelled Diagram of the Eye

A Placiodo's Disc (ophthalmic instrument) is also known as a keratoscope.


A Placiodo's Disc is not itself an ophthalmic procedure but it is included in this section of terms about ophthalmic procedures because a Placiodo's Disc is used for diagnosis / assessment prior to, and / or after, some ophthalmic procedures.

A Placiodo's Disc is an ophthalmic instrument for detecting abnormal curvature of the the cornea of the eye. It consists of a black disc that is marked with concentric white rings at whose centre is a small lens through which the ophthalmologist can observe the patient's cornea. When using this device the practitioner observes the reflections of the white rings in the patient's cornea. In the case of a normally-shaped cornea, those reflections are also a set of concentric rings. If the reflections appear to be non-circular, treatment might be recommended.

More about Ophthalmology:

This section includes short definitions of many diseases, disorders, and conditions of the eyes and visual system.
For definitions of other terms in this category, choose from the list to the left (but note that this is not a complete/exhaustive list).

Other related pages include

For further information see also our pages of books about ophthalmology.

MCQ Companion to the Eye (Textbook) The Secret of Perfect Vision: How You Can Prevent and Reverse Nearsightedness What Your Doctor May Not Tell You About(TM) Glaucoma: The Essential Treatments and Advances That Could Save Your Sight

The following books may also be of interest:

The Aging Eye (Harvard Medical School)
MCQ Companion to the Eye (Textbook)
The Secret of Perfect Vision: How You Can Prevent and Reverse Nearsightedness
What Your Doctor May Not Tell You About(TM) Glaucoma: The Essential Treatments and Advances That Could Save Your Sight

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