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IT services

This industry comprises establishments that provide internet technology services to all industries. These include maintenance and support services, network services, and professional services such as systems integration and It consulting services.

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Astigmatic effect

Eyewear; Optometry

Collective description of the cylindrical power and the cylinder axis.

Distance optical centre

Eyewear; Optometry

Optical centre of the distance portion.

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

Inset

Eyewear; Optometry

Displacement of a multifocal segment from the distance reference point towards the nose, usually whithout reference to the effect on the near optical centres.

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.

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