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Toys and games
1) Devices that are used exclusively for recreation and play. Toys are most often used with children and pets and as a medium of education and development. Toys are not always obvious in their nature. A simple bottle can be considered a toy if an individual uses it for recreational use. 2) Games are structural activities used for physical or psychological education. In most cases, games are recreation. However, games can also be considered work. For example, a professional soccer game is a career to the participants.
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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.