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Líon torthaí a aimsíodh
Number of matches found
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measurement unit specifying the refractive power of a lens by representing the reciprocal of its focal length in metres, one dioptre being equivalent to the refractive power of a lens with a focal length of one metre
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point of a lens through which light rays will pass unrefracted
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Process by which the eye changes optical power to maintain a clear image (focus) on an object as its distance varies.
Próiseas trína n-athraíonn an tsúil a cumhacht optúil le híomhá shoiléir (fócas) a choinneáil ar réad is cuma an réad a bheith níos faide uaithi nó níos giorra di.
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A form of defective colour vision in which perception of light at the red end of the spectrum is reduced.
Dathdhaille lena ngabhann aireachtáil laghdaithe ar an solas ag ceann dearg an speictrim.
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A rare form of anomalous trichromatism marked by a reduced sensitivity to blue.
Leagan neamhchoitianta den tríchómatacht aimhrialta lena ngabhann íogaireacht laghdaithe i leith gorm.