Tokai Frame Blending

Tokai’s unique way of reducing thickness on plus lenses. This results in up to 20% thinner lenses on 1.5 index and 1.6 index compared to competitors products. 

 Frame blending is new manufacturing technique from Tokai that substantially reduces lens substance to produce the thinnest lens possible.

Conventional techniques work to a minimum diameter required to cut out from a frame shape. This can be reduced further by elliptically reducing the lens to an oval type shape. However the centre thickness is still governed by the geometric centre of the lens. This will still result in a thicker lens if the patient has narrow PDs in a wider style frame or decenteration is required.

With the development of Frame blending, Tokai have patented a manufacturing technique to reduce centre substance. From an accurate frame trace the actual frame dimensions are calculated to determine the minimum lens size required. A further calculation is then made to reduce the substance at the optical centre, or the thickest point over the pupil. This results in a substantial reduction in substance, as the lens is practically blended and pushed into the actual frame shape.

Up to 20% of lens substance, depending on prescription, can be reduced using this technique, when compared to like for like prescriptions using normal methods. Tokai Frame blending can be applied to Single vision lenses, freeform bi- aspheric lenses and the Tokai range of digital freeform varifocals.