Single vision glasses
Single vision lenses will have a single set focal length. Wherever you look through the lens, you will have the same power.
Generally used for driving, watching TV and walking around. Those under 45 years old maybe able to read quite happily in these too.
Generally for computer use; make sure you select your Intermediate Add when ordering. If your prescription does not show an intermediate add but you wish to order computer glasses, you are advised to return to your optician and request it.
Exclusively for close work and reading text. You will need to enter your reading Add when ordering.