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Measuring your vision


The visual measurement, or visual acuity (sharpness) portion of your eye exam* begins by taking a look at the Snellen eye chart. A staple in any optometrist's office, the Snellen eye chart is a simple and basic test to determine your vision's proximity to 20/20—essentially how clearly you can see something from 20 feet away. Depending on your result, your eye doctor may then check for any refractive errors (whether you are nearsighted or farsighted). Using the Snellen eye chart, your eye doctor will have you look through a phoropter and test your vision against a series of lenses of varying optical power.

If your eye doctor suspects you may have astigmatism, a keratometer may also be used to measure the curvature and reflection of the front of the cornea. Together, these optometrist tools help your eye doctor narrow down the prescription needed to help you see the world with the clearest, most vivid vision possible.

An independent or employed Doctor of Optometry is located in or next door to every LensCrafters store.

Testing how your eye works

Just as important as what you see, is how you see. Your eye doctor will test your eyes to ensure they have the full range of motion and range. Often, these tests can be performed with little more than a few basic tools. Testing your pupil's reaction to light, for example, needs only a semi-darkened room, a flashlight and something to cover the eye. More advanced tools include an automated perimetry test, which uses a computer to map and calculate your visual field through a series of simple tests.

Testing how your eye works.
Looking inside your eye

Looking inside your eye

The interior of your eye is a great way to discover if you have any eye problems or possible general health conditions. As the eye is a delicate and complex organ that remains the primary mechanism for sight, science has developed tools to help eye doctors look inside easily.

The opthalmoscope allows your eye doctor to illuminate and magnify the inside of your eye, to check for cataracts, retinal problems and damaged blood vessels, which can indicate diabetes or high blood pressure. Your eye doctor may also use Optomap®, instead of using eye-dilating drops, which allows a faster and more complete image of the back of your eye to be captured. According to a study conducted by the New England College of Optometry, the Optomap-assisted exam helps optometrists to improve the examination and care they give their patients. Part of the reason for this is that a good retinal image can be captured and reviewed with the patient side-by-side.

A tonometry test measures the pressure inside the eyes to screen for glaucoma. One testing method is to lightly press a tonometer against your cornea (numbed with eyedrops), while observing the reaction through the magnified lens of a slit lamp. A newer and more comfortable method is the non-contact tonometry test, which bounces a puff of air off the cornea to measure its density.

Innovative tools and solutions like Optomap® help make it possible to accurately diagnosis of your vision and eye health while recommending the optimum vision solutions. Schedule your eye exam* with Independent Doctors of Optometry, located in or next door to your LensCrafters store. If it’s been a while since you’ve been examined, or you still have questions, learn what to expect at your eye exam.

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