Everyone’s eyes are different. That’s why the lenses for your glasses should be tailored to your individual needs, and not just your prescription. The differences between each type of lens is not always so obvious.
Single vision lenses
In short, single vision lenses are spectacle lenses that only offer ONE type of vision correction. This means that they are crafted to help people see better at either far or near distances (nearsighted or farsightedness), but never both. Single vision lenses have the same focal power throughout (top to bottom). Most people who wear spectacles before the age of 40 require single vision lenses.
Bi-focal lenses come with two vision corrections. One is on the lower part of the lens to help you read or see close-up, and the other on the upper part to help you see far is the distance prescription. After the age of 45 most people experience a slight deterioration in eyesight, thus needing special lenses for reading and possibly different lenses for seeing far. Bifocal lenses allow you to see near and far without needing to change spectacles. The line can be bothersome – creating a jump in the image – can be difficult to get used to especially when climbing stairs.
Multifocal lenses offer multiple corrections. Multifocals are ‘no-line’ lenses and offer a smooth transition as your eyes move naturally from one focal distance to another. The main benefit of multifocal lenses is sharpness of vision, complete visual freedom and an ease in adaptation between near and far vision. First time Multifocal wearers may find it slightly frustrating to get used to, as glancing to the sides may be blurry, and you re required to turn your head when looking left and right. Something to get used to!