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.
This section includes short definitions of clinical and surgical procedures
concerning the eyes and human visual system. For definitions of other
terms in this category, choose from the list to the left. Other related
pages include the diagram
of the eye, and definitions
of parts of the eye, a description
of the human retina, and the section about disorders
of the eye and visual system.
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