When getting contact lenses, before choosing the color, design and pattern, the most important thing to consider is the type. Contact lenses can either be prescription contacts or non-prescription contacts. Prescription contact lenses are specifically designed for people with known eye conditions. These people might have presbyopia, astigmatism, near sightedness, far sightedness and other known conditions. People who use to wear eye glasses and have decided to shift to contact lenses also need prescription contacts. Unlike screws and electrical outlets, contact lenses are not one-size fits all. To get the right “fit”, you need to consult an eye specialist. These are some of the things you would expect during your visit.
1) Expect the doctor to conduct a thorough eye examination. He will assess the over-all health status of your eyes. From the external structures including the conjunctiva, iris and pupil to the internal structures like the lens and cornea. He will also determine your eye’s refractive error or the amount of vision correction that’s needed. The doctor will also measure the size and curvature of both eyes, this measurement will be used as the guide for the right contact lens fit. Proper fitting will ensure clear vision and comfort
2) Expect to see these terms in your prescription, OS and OD, OS or occulo sinister means left eye, while OD or occulo dexter means right eye. Another term you’d expect to see is power or sphere which is the refractive power or vision correction of the lens, measured in diopters. Other terms include base curve and diameter, both measured in millimeters. Base curve is the curvature at the back of the lens while diameter is the actual size of the lens.
3) Expect to see dates on your prescription. Contact lens prescription typically expires in 1 year. Do not forget to obtain a new one and have your eyes checked by your doctor, once the prescription expires.