<prompt> Distant direct ophthalmoscopy is done at100 cm25 cmAs close to the face as possible1 m  <response>: Ans. b 25 cmDistant direct ophthalmoscopy is done from a distance of 20 - 25 cm, and the features of the red reflex are noted.Option ad are the same mathematical conversion, so rule them out distance for retionscopy.Option c - distance for Direct ophthalmoscopy. 