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The branch of medicine that deals with the anatomy, physiology and diseases of the eye.

Optical power

Or optical refractive power is reciprocal of the focal length measured in metres. Expressed in diopters D (DPT). Optical power D1 has an optical system with a focal length of 1m. The greater the…


An optometrist is a specialist in the correction of refractive errors. They are oriented mainly on visual examination of the front part of the eye and for the application (prescribing) of contact…

Optotype charts

An eye chart of different sized letters or symbols, used in ophthalmology to detect quality of vision. The most commonly used are Snellen eye charts.


Osmotic concentration, expressed as the total amount (in moles) of active particles (particles not undergoing membrane regardless of their size or electrical charge), dissolved in 1 litre of…

Otto Wichterle - inventor of contact lenses

Prof. Ing. RTDr. Otto Wichterle, MD. (October 27, 1913 – August 18, 1998) was the inventor of contact lenses. He was a world-renowned Czech scientist and inventor, working mainly in the field…

Oxygen permeability

Oxygen Permeability of the contact lenses is a very important figure especially in continuous wear contact lenses. The permeability…

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