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