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Vision correction

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



nägemise korrigeerimine, lühinägelik, kaugel, nägemisprobleem, erinevad läätsed, lähendav objektiiv, dioptrekt, parandus, nõgus lääts, kumer lääts, objektiiv, prillid, kontaktläätsed, inimene, Bioloogia

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The human eye

The eye is one of our most important sense organs. When stimulated by light, electric impulses are produced by its receptors.

The mechanism of vision

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.

Colour vision deficiency

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

Flat feet

Flat feet, or fallen arches, may cause a number of health problems.

Kõrv ja kuulmine

Kuulmiselund muundab õhuvõnked närviimpulssideks, mida seejärel ajus töödeldakse.


Observatories are often built at high elevations to minimise the effects of atmospheric turbulence

Optical instruments

A wide variety of optical instruments are in use today, ranging from microscopes to telescopes.


This animation shows optical and radiotelescopes used in astronomical observation.

The reflection and refraction of light

A ray of light is reflected or refracted at the boundary of two mediums with different refractive indices.

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