Non-profit organizations

Non-profit organizations

Abbreviated as NGO, and also known as not-for-profit organisation; an organisation that does not distribute its surplus capital to shareholders or owners, but instead uses them to pursue its original goals.They are usually exempt from income and property tax and most often include charitable organisations, trade unions and public arts organisations.

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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.