Optometrists now commonly work with a device called an autorefractor to get a patient’s prescription for glasses. This product uses infrared radiation. Could this machine cause damage to the eye since it uses radiation? Will it be safer to choose only a conventional eye exam without the equipment?
The auto refractors and keratometers are just computer-controlled machines used during a watch examination to offer an objective measurement of a person’s refractive error and prescription for glasses or contact lenses. This is achieved by measuring how light is changed because it enters a person’s eye. The infrared radiation found in autorefractors resembles heatwaves and doesn’t cause injury to the eyes.
You may already know just something concerning the electromagnetic (EM) spectrum. The light we see is an area of the EM spectrum. Radio waves, microwaves, and x rays are element of it, too. Another part is called infrared.
Like all elements of the EM spectrum, infrared is a type of energy that moves in waves. Our eyes can’t see infrared waves. We can’t see radio, microwaves, or x rays either. Infrared waves act in the same ways that light does. Infrared is reflected (or bounces off) light things much better than dark things. It is absorbed by dark things much better than by light things. Light travels in a straight line, and so do infrared waves.
Your TV remote sends out a beam of infrared waves. Infrared can also be found in a sauna. The heating effect there is due to wavelengths of more than 1,500 nanometers (nm). The infrared wavelength in the autorefractor is just around 900 nm, so there are no observable heating effects.
In the autorefractor, the infrared waves are machine-generated. Near-infrared radiation (NIR, specifically 880 ± 80 nm) is used. The reason why that is used is basically that the fundus efficiently reflects NIR, and this NIR is invisible to your visual system. The NIR travels through the cornea, lens, vitreous, etc.; bounces off the retina to visit back through the eye media; and is read by a warning in the machine.
Scientists believe that autorefractors are a completely safe technology, and there is no proof of documented injury. Ophthalmologists use them all the time to get a rough estimate of the patient’s refraction, just before checking refraction with the chiropter (lenses). Autorefraction is generally regarded as a screening test and therefore is beneficial to the optometrist. The outcome still needs to be fine-tuned with a normal refraction test (old-fashioned exam), so there would be no loss for your requirements if you refused the autorefractor test.Read More No comments