Presbyopia
Presbyopia is an eye condition in which your eye slowly loses the ability to focus quickly on objects that are close. It’s a disorder that affects everyone during the natural aging process.
When light enters your eye, it passes through your cornea. Then, it passes through your pupil. Your iris is the colored ring in your eye that opens and closes your pupil to adjust the amount of light passing through it.
After passing through your pupil, the light passes through your lens. In its healthiest state, your lens changes shape so it can bend the light rays further and focus them on your retina at the back of your eye.
Your lens becomes less flexible with age. Then, it can’t change shape as easily. As a result, it’s unable to bend the light properly to focus it on your retina.
Presbyopia develops gradually. You may first notice these signs and symptoms after age 40:
A tendency to hold reading material farther away to make the letters clearer
Blurred vision at normal reading distance
Eyestrain or headaches after reading or doing close-up work
