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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.
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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.
Concave and convex lenses are used for the correction of short-sightedness and far-sightedness.
The inability to differentiate certain shades of colour is called colour vision deficiency.
This animation demonstrates the structure and operation of digital cameras.
This animation introduces the most important organ systems of the human body.
This animation shows the symptoms and treatment of secretory otitis media.
Olfactory receptors produce electric signals when stimulated by odours.
This animation shows optical and radiotelescopes used in astronomical observation.
The ear converts the vibrations of air into electric signals which are then processed by the brain.
This scene summarizes the main organs of the human body.
Taste receptors convert chemical stimuli into electric signals.
The position and acceleration of the head is detected by the inner ear.
Organs that detect signals of the environment or of the body and transmit them to the brain as nerve impulses.
Several analogous types of eyes have developed independently through convergent evolution.
A ray of light is reflected or refracted at the boundary of two mediums with different refractive indices.
A wide variety of optical instruments are in use today, ranging from microscopes to telescopes.