Abnormal, harmful, or undesirable effect on an organism that causes anatomical or functional damage, irreversible physical changes, or increases the susceptibility to other biological, chemical, or environmental stresses.
Optometrists can prescribe glasses, contact lenses, eye exercises, vision aids and therapy, and (in some states) oral and topical medications to treat certain eye diseases. Ophthalmologists are doctors of the eye. They have graduated from medical school and are licensed to practice medicine, so their credentials are either doctor of medicine (MD) or doctor of osteopathy (DO).
Is a prescription required to purchase reading glasses? No. Reading glasses are available in standard, select powers, typically ranging from +1.00 to +4.00. What is Presbyopia? It is a condition that progresses with age where the eyes diminish in the ability to focus on near objects. Reading glasses help magnify object or text, thus relieving strain on your eyes.