Glasses bend light before it enters the eye
Lenses change the focus of light onto the retina
Nearsightedness is corrected with concave lenses
Farsightedness is corrected with convex lenses
Astigmatism is corrected with cylindrical lenses
Reading glasses help focus on close objects
Prescription strength matches the wearer’s vision needs
Frames hold the lenses in front of the eyes
Glasses improve clarity and reduce eye strain