Focometer
Focometer
The Focometer (pronounced: /ˈfoʊkəˌmiːtər/) is a portable, low-cost, and easy-to-use device designed to measure refractive error in the human eye. It was developed to address the global need for affordable and accessible eye care solutions, particularly in low-resource settings.
Etymology
The term "Focometer" is derived from the Latin word "focus", meaning "fireplace, hearth", and the Greek word "metron", meaning "measure". It essentially translates to "measure of focus", referring to its function of measuring the eye's ability to focus light.
Function
The Focometer works by projecting a series of concentric circles onto the retina. The user adjusts the device until the circles align, which indicates the correct refractive power for the individual's eye. This method allows for a quick and accurate measurement of myopia (nearsightedness), hyperopia (farsightedness), and astigmatism.
Related Terms
- Refractive error: A common eye disorder where the eye cannot clearly focus the images from the outside world. The main types of refractive errors are myopia, hyperopia, and astigmatism.
- Myopia: A condition where close objects appear clearly, but distant objects appear blurry.
- Hyperopia: A condition where distant objects may be seen more clearly than objects that are near.
- Astigmatism: A condition where vision is blurred due to an irregular shape of the cornea or lens.
- Refractive power: The ability of the eye to bend light so that an image is focused on the retina.
External links
- Medical encyclopedia article on Focometer
- Wikipedia's article - Focometer
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