Question
Identify the instrument shown in the picture below ?
| A. |
Maddox rod.
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| B. |
Maddox wing.
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| C. |
Placido disc.
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| D. |
None of the above.
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Show Answer
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Correct Answer � C
Explanation
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Ans:C.) Placido disc.
Keratoscope ,also known as Placido’s disc
- It 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 patient is suffering from astigmatism or from a corneal dystrophy, the rings will be distorted.
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