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).
If an eye examination reveals that you need glasses, the optometrist will write a prescription for your corrective lenses. Depending on your needs, you may be able to choose between eyeglasses and contact lenses. If you choose glasses, you will need to choose eyeglass frames when you have your prescription filled. If youâve dreaded having to wear glasses, the many styles and fashions available in eyewear today can help alleviate that dread.