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Glossary of terms

We have prepared a glossary to explain you some medical names or expressions that you may not understand clearly and fully.


Accomodation is changing the curvature of the lens in order to focus the eye on objects at different distances from it
Amblyopia is the medical name for amblyopia, reduced visual acuity without apparent pathological cause
Anisometropia is the condition in which the two eyes have unequal refractive power; that is, are in different states of myopia


is an optical defect in which vision is blurred due to the inability of the optics of the eye to focus a point object into a sharp focused image on the retina


by both eyes


eyes rotate towards each other


is the paralysis of the ciliary muscle of the eye, resulting in a loss of accommodation

Dioptre or diopter is a unit of measurement of the optical power of a lens or curved mirror which is equal to the reciprocal of the focal length measured in metres. This unit tells you how much it is necessary to correct the eye defect.
Diplopia double vision
Divergence eyes are turning away from each other
Farsightedness, or hyperopia is a vision condition in which distant objects are usually seen clearly, but close ones do not come into proper focus. Farsightedness is corrected with convex (plus) lenses.
Heterophorias is the hidden squint
Heterotropia is the clear squint
Monocular by one eye
Motility is the ocular motility in all directions
Nearsightedness (myopia)  is a common vision condition in which you can see objects near to you clearly, but objects farther away are blurry. Myopia is corrected with concave (minus) lenses
Ophthalmology Medicínský název pro oční lékařství.
Occluder is a cover of the eye (for example a plaster, gauze, contact lens, occluder made of plastic, ...), which is used in the treatment of amblyopia for covering the healthy eye
Orthoptic exercises  are exercises that are used in the treatment of paediatric strabismus. The target of these exercises is to practice vision with both eyes.
Orthoptics is correction of the binocular vision (vision with both eyes)
Orthoptist  is an expert who practices with children and thus helps them to improve their vision
Pleoptic exercises are exercises that are used in the treatment of paediatric amblyopia. The target of these exercises is loading the affected eye by close work.
Pleoptics is the treatment of amblyopia
PlusOptix is a special non-contact device for measuring of refractive disorders and strabismus in children
Prizm prizm lens
Refractive disorder  occurs when an eye cannot clearly focus the images from the outside world. The result of refractive errors is blurred vision, which is sometimes so severe that it causes visual impairment. The three most common refractive errors are nearsightedness, farsightedness and astigmatism. 
Screening is the vision screening carried out in order to discover diseases in their early stages, when the patient does not have any problems or symptoms
Stereopsis is spatial vision
Strabismus is the medical name for squint
Strabologist is an expert in the diagnosis and treatment of strabismus
Strabology is the branch of ophthalmology dealing with squint
Superposition is the ability to see a single image by combining two dissimilar perceptions
Synoptofor is a special orthoptic device used to diagnose disorders of binocular vision and carry out eye exercises
Unification  is the ability to link two identical images of both eyes in a simple one
Visus is visual acuity


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