| A | B |
| myopia | difficulty seeing distant objects |
| hyperopia | difficulty seeing close objects |
| Astigmatism | irregular shaped cornea causing, resulting in blurry vision |
| Presbyopia | The 40 year old vision problem causing difficulty to read. |
| amblyopia | lazy eye; poor vision in one eye |
| strabismus | cross eyed; one eye focuses and ther other eye strays |
| cornea | transparent anterior portion of the outer layer of the eye |
| Optometrist | Not a medical doctor, but examines eyes, prescribes eyeglasses and contact lenses, diagnose disease, and prescribes drugs |
| Opthalmologist | Medical Doctor who diagnosesas and treats injuries and disorders of the eye; performs major eye surgeries. |
| cataracts | cloudy covering that appears over the eye lens, obstructing clarity of the vision |
| Orthoptist | diagnose and treat problems with eye muscles. |
| Optician | fits eyeglasses and contact lenses by following written prescriptions of Opthalmologists or optometrists. |
| visual acuity | the ability to see |