Reading glasses are spectacles with positive (convex) lenses, designed to enable you to see objects clearly at close range. You mainly use reading glasses for tasks that require you to look at things up close: reading, writing, doing handicrafts, looking at your mobile phone or working on a computer.
Most people need reading glasses from their 40s to 50s, when the eye’s lens becomes less flexible and the eye struggles to focus at close range. This condition is known as age-related long-sightedness or presbyopia. Even people who are naturally long-sighted may need reading glasses for close-up work at a younger age.
The strength of reading glasses is expressed in dioptres, with a plus sign, for example +1.00 or +2.50. The higher the number, the stronger the correction. The strength you need depends on your age and the extent to which your eye’s lens can still accommodate.
Reading glasses only correct vision at close range. If you hold them up and look into the distance, your vision will be blurred. For people who need correction for both near and far vision, there are multifocal or progressive glasses, as well as multifocal contact lenses.