Shelburne Optometry’s Eye Care Technology

The TONOREF III combines the technology of an autorefractor, keratometer, tonometer, and pachymeter. Each test is quick and non-invasive. When you participate in the following tests, you will rest your chin on the chinrest of the machine. This will stabilize your head while you focus on light or an image during each test.

Autorefractor

An autorefractor will test your eye for any refractive errors that keep you from seeing clearly. A refractive error occurs when the light cannot focus properly on the retina.

The 4 main refractive errors include:

• Myopia
• Hyperopia
• Astigmatism
• Presbyopia

During the test, your eye will focus on an image, light will shine into your eye, and a measurement will be made by how the light changes when it bounces back off the retina.

The measurement will determine how much correction the eyes need with glasses or contact lenses.

Keratometer

Keratometry measures the curvature of the cornea. One of the main reasons to use this test is to check for astigmatism.

During this exam, a circle of light is focused on your retina. The measurement of reflection is used to determine if correction is needed and what those options are.

It’s also common for a keratometer to be used before and after eye surgery to monitor the shape of the eye and any possible changes.

Tonometer

Tonometry is a diagnostic tool that measures the pressure inside your eyes to test for glaucoma.

We use the TONOREF III non-contact tonometer. It’s a less invasive tonometer, non-contact tonometry, which uses a small puff of air to measure intraocular pressure based on the eye’s resistance to the air puff. Because it doesn’t make contact with the eye, patients won’t require anesthesia before the test.

We can also employ the use of Goldmann applanation tonometry. Considered the “gold standard” for testing IOP, the Goldmann tonometer measures the force required to flatten the cornea using a small probe. Because the probe makes contact with the eye, your eyes will be numbed first.

Pachymeter

A pachymeter measures the thickness of your cornea. It’s often used prior to a refractive surgery, to check for keratoconus, or to screen for glaucoma.

A phoropter is an instrument you look through to test individual lenses on each eye during your eye exam. It’s an important assessment tool for measuring any refractive errors and determining the correct prescription.

With the advanced technology of the RT-5100, you can ensure an accurate and reliable reading to find the most comfortable prescription for you.

The Humphrey Field Analyzer (HFA) 3 from ZEISS is a device used to measure visual fields. This technology can detect monocular visual fields, which assists in the diagnosis of certain eye conditions such as glaucoma.

With the HFA 3 from ZEISS, testing time is reduced without compromising accuracy and precision.