Opto Tech Office 14 Progressive Lenses

Short Description:

In general, an office lens is an optimized reading lens with the ability to have clear vision also in the middle distance. The useable distance can be controlled by the dynamic power of the office lens. The more dynamic power the lens has, the more it can be used also for the distance. Single-vision reading glasses only correct the reading distance of 30-40 cm. On computers, with homework or when you play an instrument, also the intermediate distances are important. Any desired degressive (dynamic) power from 0.5 to 2.75 allows a distance view of 0.80 m up to 4.00 m. We offer several progressive lenses that are designed specifically for computer and office use. These lenses offer enhanced intermediate and near viewing zones, at the expense of distance utility.

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Specification

Office 14

Enhanced Intermediate Zones for Different Purposes

Prescribed	Dynamic Power Office Lens
Add. Power	-0.75	-1.25	-1.75	-2.25
0.75	infinity
1.00	4.00
1.25	2.00	infinity
1.50	1.35	4.00
1.75	1.00	2.00	infinity
2.00	0.80	1.35	4.00
2.25		1.00	2.00	infinity
2.50		0.80	1.35	4.00
2.75			1.00	2.00
3.00			0.80	1.35
3.25				1.00
3.5				0.80

How to make freeform progressive ?

The freeform progressive lens uses the back surface freeform technology which places the progressive surface on the back of the lenses, providing you with a wider field of vision.
Freeform progressive lens is fabricated differently than any other type of lens design. The lens currently costs more than traditionally produced lens, but the visual benefits are apparent. Using proprietary software and computer numerically controlled (CNC) technology, the required patient specification can be very rapidly interpreted as the design criterion, which is then fed to high speed and precision freeform machinery. This consists of three dimensional diamond cutting spindles, which grind the highly complex lens surfaces to an accuracy of 0.01D. It is possible to grind either or both lens surfaces using this method. With the latest generation of varifocals, some manufacturers retained the moulded semi-finished blanks and use free-form technology to produce the optimum prescription surface.