Colour vision deficiency
The inability to differentiate certain shades of colour is called colour vision deficiency.
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The eye is one of our most important sense organs. When stimulated by light, electric impulses are produced by its receptors.
The curvature of the lens of the eye changes when we look at a distant or at a near object, to ensure a sharp image.
Concave and convex lenses are used for the correction of short-sightedness and far-sightedness.
Several analogous types of eyes have developed independently through convergent evolution.
A liquid-crystal display utilises the light modulating properties of liquid crystals.
This animation explains how a plasma display television works.
The central nervous system consists of the brain and the spinal cord, the peripheral nervous system consists of nerves and ganglia.
Neurons transmit electrical signals via chemical and electrical synapses.