Autorefractor Keratometer ARK

Autorefractor Keratometer ARK

An autorefractor keratometer (ARK) is a diagnostic ophthalmic equipment used to measure the refractive errors of the eye and the curvature of the cornea. It is an essential tool in determining the appropriate prescription for glasses or contact lenses. The ARK combines two functions - autorefraction and keratometry - into a single device.

Collection of Autorefractors Keratometer at Angelus Medical Includes: Canon ARK  autorefractor, Nidek refractor and more

The autorefraction function of the ARK measures the refractive error of the eye, which includes nearsightedness (myopia), farsightedness (hyperopia), and astigmatism. It does this by projecting a series of light rays into the eye and analyzing the pattern of reflection to estimate the eye's refractive power.

The keratometry function of the ARK measures the curvature of the cornea, which is important for diagnosing and monitoring conditions such as astigmatism and keratoconus. It does this by analyzing the reflected light from the anterior surface of the cornea.

Frequently Asked Questions

How does an autorefractor keratometer work? 

The ARK projects light into the eye and measures the pattern of reflection to determine the refractive errors and corneal curvature.

Is the ARK exam painful or uncomfortable? 

No, the ARK exam is completely painless and non-invasive. You simply need to look into the device and focus on a target.

How long does an ARK exam typically take? 

The exam usually takes just a few minutes, as the measurements are quickly obtained by the machine.

Are there any preparations required before an ARK exam? 

Generally, no significant preparation is needed. You may be instructed to remove your contact lenses before the exam, as they can affect the accuracy of the measurements.

Can an ARK exam be performed on children? 

Yes, autorefractor keratometers can be used on individuals of all ages, including children. It is particularly useful for assessing the vision of young children who may not be able to participate in other types of subjective vision testing.

How accurate are the measurements obtained from an ARK? 

Autorefractor keratometers provide highly accurate and reliable measurements, although they may not be as precise as subjective refraction performed by an optometrist or ophthalmologist.