Some types of prescription lenses
These are prescribed either for general use in younger patients (early 40’s or younger) or, in older patients, for vision at one specific focus (distance, for computer (arms length) or for reading).
This lens design is usually reserved for the over-50 age bracket, who need a general pair of eyeglasses that will allow simultaneous vision in all areas. They are very popular as they can be worn most of the time, rather than having to put them on and off all the time. They come in many designs to cater for different frame shapes and working distances. Some people can have difficult adjusting to multifocals, but this is rare if they are fitted properly by an expert, and it tends to settle down with a few days to weeks.
This design now is very popular for office workers, who have minimal distance requirements during the working day, but have a high demand in reading a computer screen and documents.
These lenses are specially shaped to align the images seen by each eye. This avoids double vision or eyestrain in susceptible people. They look just like normal spectacle lenses, although they may look a little thicker at one edge than the other (although this is usually very subtle). During your eye examination, your optometrist will assess your eyes to see if prism is required.