Thinner Convex Organic Lens
Oval cut is a technique developed to achieve a thinner convex organic lens. It may be applied on all organic lenses in the form of monofocal, bifocal and multifocal
The Axis Needs To Be
Between 45-135 Range in (-) Cylinder.
The Axis Needs To Be Between Either 0-45
Or 135-180 in (+) Cylinder.
In order to take an advantage from the ovoid cut technique, the spherical part of an organic cylindrical or mixed lens must be of convex and, the axis thereof must be in the axis direction indicated in green..
Other important factors, in addition to the axis direction, to get the maximum thinness in an ovoid lens are the cylindrical value and vertical height of the lens. As the cylindrical value increases, the difference between the vertical and horizontal sizes of an ovoid lens should increase accordingly. In case of a cylindrical value of 2.00 D, the difference between the vertical and horizontal sizes of a lens should be at least 10 mm. In case of a cylindrical value of 3.00 D or more, the vertical-horizontal difference should be greater for a more aesthetic oval lens.
Please see the following examples to understand the impact of the reduction in only the vertical size of an ovoid lens for a lens with an index of 1.5 and, power of +4.00 + 4.00 x 180.
In case of an order processed drawing the frame template, our technicians would calculate the sizes of an ovoid lens required to achieve the thinnest cylindrical or mixed organic lens on the computers, the production would take place accordingly.
If you indicate your choice of frame as normal, fishline or facet, then the thinnest organic lenses would be manufactured suitable for your frame.
There is no need to indicate the ovoid cut sizes if you place an order drawing the frame template.
Ovoid cut would not bring any advantage in case of all spherical lenses, all concave lenses and convex, cylindrical and mixed lenses with an axis direction outside the colored area above.