When you acquire contact lenses, you need to get an eye exam that includes special tests that are not normally preformed during traditional eye exams for eyeglasses. To wear them, you will need a prescription which is different than an eyeglasses prescription.
Contact Lens Fitting
When you go to your optician for an eye exam, the optician will perform series of tests to determine your eye health and for a correct contact lens fitting. Using an eye chart, your visual acuity will be tested. The optician will do a series of eye tests that will include a refraction test to find out if there are any refractive errors.
After the eye exam testing is complete, your optician will collect information for fitting contact lenses. This can include questions about lifestyle, contact lens preferences such as colored , overnight wear lenses, daily disposables, extended wear disposables, etc. The optician will also determine if you should have soft contacts or rigid gas permeable lenses such as if you have a condition called astigmatism.
If you are older, your optician will look for a condition called presbyopia which decreases the ability to read fine print. You may be offered a choice of either multifocal or bifocal contact lenses. There are also monovision lenses that corrects one eye for distance vision and the other eye is corrected for near vision
Contact Lens Measurements
The following methods are used to measure your eyes for contacts. A device known as a keratometer is used to measure the curvature of your eye's cornea. The keratometer analyzes light reflections from your cornea and determines the curvature of the surface of the eye. The measurements assist the optician with determining the correct size and curve for your contacts. Computerized measurements of your cornea may also be performed. Corneal topography analyzes photographic images taken of the way light projected into your eye travels. A computer produces and prints out a surface mapping of your eye. Displayed are various contours of the eye which is illustrated by various colors. The test helps the optician determine the type of contact lenses that will give you the sharpest vision,
If your eye's surface is irregular because of astigmatism, you may need to have Toric contacts which are shaped to offset distortions of the eye in order to provide clear and sharp vision. Toric lenses are also available in multifocal, extended wear, disposable, and colored lenses. Contact lens fittings may also include a tear film evaluation.
Buying Contact Lenses Online
When you buy contacts, a great resource is the internet. There are reputable online sellers that offer a wide range of contacts at greatly discounted prices. You will be required to submit a recent prescription when your order online. Buying online is an easy and very affordable way to get the contact lenses you need for sight correction.
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