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Astigmatic effect
Eyewear; Optometry
Collective description of the cylindrical power and the cylinder axis.
Reference seeing distance
Eyewear; Optometry
Agreed distance of 250 mm between the object side (first) nodal point of the eye and the object observed. The reference seeing distance is used, above all, as a reference ...
Intraocular pressure
Eyewear; Optometry
Eye pressure, as determined by the amount of aqueous humour filling it. High IOP (ocular hypertension) can be a sign of glaucoma
Interpupillary distance
Eyewear; Optometry
Distance between the centres of the pupils when the eyes are fixating an object at an infinite distance in the straight-ahead position.
Fitting point position
Eyewear; Optometry
Vertical and horizontal fitting distances and directions of the fitting point from the boxed centre of the lens shape.
