These type of lenses have two prescriptions within the lens, this is where it gets its name Bifocal. The top part of the lens has a large distance section, the visible segment at the bottom is where the reading prescription is present. This lens corrects vision for those who need two separate prescriptions in their spectacles (PRESBYOPIA PRESCRIPTION).
They have a very stable prescription for the wearer with a clear line to show exactly where the reading section starts. The difference between Bifocal and Varifocal lenses is that varifocals don't have any visible segment on the surface. Varifocals also have three different focal points for the wearer. This extra focal point is what we call intermediate, which is at around arm's length (computer work).
Reglazing your Bifocals is as simple as replacing like for like but with the new updated prescription. If you don't have any bifocal lenses present in your glasses we may need a picture. We'll ask for a picture so we can identify where to fit your bifocal segment so it doesn't impede your distance vision.
If you are unsure please contact us on 0161 327 2402 and we'll help you through this process.