When you hear the term ocular refraction, you probably would guess that this term has something to do with our eyes or eyesight. Ocular refraction, in fact, refers to certain refractive errors in our eyes, which might indicate the need for corrective lenses. A device known as a dioptometer can be used to measure this ocular refraction and help an optometrist or ophthalmologist create a plan to improve your eyesight.
There are several different types of ocular refraction or refraction errors that are associated with eyesight. All of these “errors” are related to the shape of the eye and the eye’s inability to focus light on the retina. For instance, with a person who has near-sightedness, light will focus in front of the retina rather than on the retina. These individuals can see close objects fairly well, but object farther away will seem blurred.
For those who are far-sighted, the light will focus behind the retina causing objects that are close to the eye to appear blurry, while objects farther away might look normal.
Other refractive errors include astigmatism, which can cause objects to look blurry both near and far. Astigmatism is an error caused when the eye focuses light on the retina unevenly. A dioptometer can help an eye doctor determine the scope of each of these three refractive errors.
However, that is not the only use for the dioptometer. This optical tool also can be used to measure as well as calibrate other optical instruments. For instance, one could check the power of a microscope lens as well as the range of focus and the range of magnification. This device also could be used to measure the curvature of lenses as well as testing telescopes for astigmatism.
Some optical devices, such as cameras also might include diopter adjustment. This little dial can be very helpful for photographers with less than perfect vision. Adjusting the diopter will provide you with a more accurate view from your viewfinder. If you’ve ever noticed that what you see differs from the picture that is produced, adjusting the diopter might help. This feature also can be quite helpful if you are using manual focus when shooting pictures, rather than relying on auto-focus. It is important to note that when you want to make diopter adjustments, you should mount the camera on a tripod so that the camera will remain as still as possible.
Our own WK-29-3100 Dioptometer can be used to check the range and make the zero setting of several different focusing eyepieces of tools such as theodolites, range finders, binoculars, spectrometers, telescopes and other optical instruments. Our selection of instruments also includes the WK-29-3500 Millidioptometer, which can be used to set the diopter scale reading for various optical systems. This device also measures the spherical power and astigmatism of prisms.
If you need a dioptometer, millidioptometer or another type of optical instrument, take a look at our selection. In addition to the aforementioned devices, we have alignment telescopes, collimators, marine alidades, theodolites and much more. If you don’t see precisely what you need, our team of experts can create a custom design that meets your needs.