Welch Allyn 18200 Bedienungsanleitung Seite 4

The streak retinoscope is found by most practitioners to be easy to
use, fast, accurate, and especially valuable in determining the axis of
astigmatism.
There are several features of the streak retinoscope that make
determining the refractive state of the eye easy and accurate. These
are:
1. Each meridian can be neutralized separately.
2. All errors can be neutralized using either "with" or "against"
motion or perhaps using both.
3. The axis of astigmatism is apparent.
4. Streak retinoscopy is easy because one watches a band of light
instead of a shadow.
5. Streak retinoscopy may easily be done with undilated pupils.
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