Bifocals or multi-focal's to give them there correct term are fantastic lenses, they include two or three distant visual zones. There are so many types of lenses, straight segs, round segs, D segs (glass) and the executive type, not to mention the up-curve, double D, trifocals such as straight and
round, executive with a straight top the list continues.
The major advantage of multi-focal's over progressives is the clear area of vision. The advantages of this are clear, no distortion or area of no us on the lenses. As a Dispensing Optician this means I can ensure I can give a patient defined clear areas of vision designed for the work tasks they need them to do. There are a few restrictions on the prescriptions that can be used, but most can be overcome with a small modification.
The manufactures of multi-focal lenses have started to progress again as there is a clear demand for the lenses and more dispensing Opticians are going back to this kind of lens. Norville Optical have developed a seamless lens and a very high index plastic (n=1.74) lens so even very short sighted people can now benefit from thin lenses.
The need for this type of lens is still valid and patients need to get over the fact that there may be a small line on the lenses as the vision is second to none and the cost matches as well.
