Colour vision deficiency

Colour vision deficiency

The inability to differentiate certain shades of colour is called colour vision deficiency.



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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.

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Concave and convex lenses are used for the correction of short-sightedness and far-sightedness.

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Several analogous types of eyes have developed independently through convergent evolution.

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Nervous system

The central nervous system consists of the brain and the spinal cord, the peripheral nervous system consists of nerves and ganglia.

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Neurons transmit electrical signals via chemical and electrical synapses.

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