Refraction is a favourite exam topic (and one which is often very poorly performed!). Usually the candidate is asked to perform retinoscopy on one eye (often dilated and cyclopleged) followed by subjective refraction (depending on the length of the station). The patient is often a medical resident, carefully selected for their high myopia and astigmatism, so if the retinoscopy reflex is very dull, try putting up a high minus (or plus) lens early.
In examinations, equipment will often be provided, but having your own retinoscope that you are familiar with is advantageous.
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