LogMAR chart
LogMAR Chart
The LogMAR Chart (pronounced: /lɒɡmɑːr tʃɑːrt/), also known as the Logarithm of the Minimum Angle of Resolution Chart, is a type of Visual acuity testing tool used in Ophthalmology and Optometry. The term "LogMAR" is derived from the words "logarithm" and "minimum angle of resolution", indicating its function in measuring the smallest visual angle a person can perceive.
Etymology
The term "LogMAR" is an acronym for "Logarithm of the Minimum Angle of Resolution". The "logarithm" part refers to the mathematical function used to calculate the score, while the "minimum angle of resolution" refers to the smallest visual angle that can be perceived by the human eye.
Usage
The LogMAR chart is used to assess Visual acuity, which is a measure of the spatial resolution of the visual processing system. It is commonly used in Ophthalmology and Optometry to diagnose and monitor various eye conditions, such as Myopia, Hyperopia, and Astigmatism. The chart consists of rows of letters, with each row corresponding to a specific level of visual acuity. The patient is asked to read the letters from a set distance, and the smallest row they can read accurately determines their visual acuity score.
Related Terms
- Visual acuity: The sharpness of vision, measured by the ability to discern letters or numbers at a given distance according to a standard chart.
- Ophthalmology: The branch of medicine that deals with the diagnosis and treatment of eye disorders.
- Optometry: The practice or profession of examining the eyes for visual defects and prescribing corrective lenses.
- Myopia: A condition in which close objects appear clearly, but far ones don't.
- Hyperopia: A condition in which distant objects can be seen clearly, but close ones do not come into proper focus.
- Astigmatism: A common vision condition that causes blurred vision due to the irregular shape of the cornea or the lens inside the eye.
External links
- Medical encyclopedia article on LogMAR chart
- Wikipedia's article - LogMAR chart
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