Discussion
Arrange the following layers of Retina in order of light travelling from environment to back of the eyeball :
I. Ganglion cells
II. Cone receptors
III. Horizontal cells
IV. Bipolar cells
Codes :
Answer: D
Light entering the eye passes first through the layer of ganglion cells, then the bipolar cells, then the horizontal cells and finally reaches the photoreceptors, the rods and cones. The order is therefore ganglion cells (I), bipolar cells (IV), horizontal cells (III) and cone receptors (II), that is I, IV, III, II.
The retina is inverted in this sense: the receptors lie at the back, and light has to pass through the other layers before it reaches them. The other sequences put the receptors first, which reverses this.
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