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Use a pen-torch or direct ophthalmoscope as the light source and illuminate the pupil from below (or temporally) at a distance of 5-10cm.
This is highly suited to examination with a direct ophthalmoscope and has a well-established evidence base for single field digital fundus screening.
Leucocoria can be identified with the direct ophthalmoscope and in advanced cases may be visible with the naked eye.
Examination included best corrected visual acuity and undilated fundoscopy using a direct ophthalmoscope.

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