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Retinoscopes were used at arms length
to estimate the patient's refraction. The calibrations around the
outside are the axis of the astigmatism. The light would be situated
next to the patient shining towards the examiner and reflected from
the mirror or glass into the patient's eye. Presumably, the cogs can
revolve the 'streak' formed by the mirror/glass to the axis of the
astigmatism. It is a beautifully made instrument with a detachable
ivory handle in its own silk and velvet case leather case. All in
excellent condition. |
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