On performing refraction using plane mirror on a patient who’s has a refractive error of -3 D sphere with -2 D cylinder at 90 degree from a distance 1 metre under no cyclopgia, the reflex would be seen to move
Correct Answer: Against the movement in both the axis
Description: Error of -3 D sphere that is person using concave sphere(diverging) advised in cases of myopia. Reflection of ligth with Retinoscope 1. Against / opposite movement : Myopia > -1 2. With / same movement Myopia < -1 or Emmetropia = 1 or Hypermetropia = + value 3. No movement Myopia = -1 This patient is having a -3DS with -2DC x 90 - compound myopic astigmatism, so the reflex would move in opposite direction to the beam irrespective of the axis
Category:
Ophthalmology
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