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	~~'''Eye chart''' is a chart used by [[optometrists]] and [[ophthalmologists]] to measure [[visual acuity]]. Eye~~ charts ~~are often~~ used in ~~various [[healthcare]] settings, including clinics, hospitals, and schools.~~		{{short description\|An article about eye charts used in vision testing}}

	== ~~History~~ ==		== Eye chart ==
	~~The first~~ eye chart ~~was developed~~ by [[~~Herman Snellen~~]] in ~~1862~~. ~~The~~ [[~~Snellen~~ chart]] ~~is still in use today, although many other types of eye charts have been developed since then.~~		An '''eye chart''' is a tool used by [[optometrists]] and [[ophthalmologists]] to measure [[visual acuity]]. Eye charts are essential in diagnosing [[vision impairment]] and determining the need for [[corrective lenses]].

			[[File:Japanese_eye_chart.JPG\|thumb\|right\|A Japanese eye chart used for testing visual acuity.]]

	== Types of Eye Charts ==		== Types of Eye Charts ==
	There are several types of eye charts used in ~~the field of [[optometry]] and [[ophthalmology]]~~. ~~These~~ include:		There are several types of eye charts used around the world, each designed to test vision in different ways. The most common types include:

	* '''[[Snellen chart]]~~''': This~~ is the most ~~commonly~~ used eye chart. It consists of 11 lines of block letters, with the ~~size of the~~ letters ~~decreasing~~ as ~~you move~~ down the chart.		=== Snellen Chart ===
			The [[Snellen chart]] is the most widely used eye chart in the world. It consists of 11 lines of block letters, with the top line containing one very large letter. The letters become progressively smaller as one reads down the chart. The standard testing distance is 20 feet.

	* '''[[LogMAR chart]]~~''': This chart~~ is used for more precise measurements of visual acuity. It uses ~~the same principle as the Snellen chart, but the letters are arranged in~~ a logarithmic scale.		=== LogMAR Chart ===
			The [[LogMAR chart]] is used for more precise measurements of visual acuity. It is often used in research settings and for patients with low vision. The chart uses a logarithmic scale to measure vision.

	* '''[[Tumbling E chart]]~~''': This chart~~ is used for ~~people~~ who cannot read~~, such as young children or illiterate adults~~. It consists ~~of rows~~ of the letter 'E~~' facing~~ in different ~~directions~~.		=== Tumbling E Chart ===
			The [[Tumbling E chart]] is used for patients who are illiterate or for young children who cannot read. It consists of the letter "E" in different orientations, and the patient must indicate the direction the "E" is facing.

	* '''[[Landolt C chart]]~~''': This chart~~ is similar to the Tumbling E chart, but it uses a ~~broken~~ ring ~~or '~~C~~' instead~~ of the ~~letter 'E'~~.		=== Landolt C Chart ===
			The [[Landolt C chart]] is similar to the Tumbling E chart but uses a ring with a gap (the "C") in different orientations. The patient must identify the direction of the gap.

	== ~~How~~ Eye ~~Charts Work~~ ==		=== Japanese Eye Chart ===
	~~Eye charts work by measuring how well a person can see details at a specific distance~~. ~~The person~~ is ~~asked~~ to ~~read the smallest line of letters they can see from~~ a ~~distance of 20 feet. The results are then expressed as a fraction, with the numerator being the distance the person was from~~ the chart ~~and the denominator being the distance at which a person with normal vision could read the same line~~.		The Japanese eye chart, as shown in the image, is used in Japan and features symbols that are culturally relevant. It is designed to test visual acuity in a manner similar to the Snellen chart.

	== ~~Limitations of Eye Charts~~ ==		== Usage ==
	~~While eye~~ charts are a ~~useful tool in measuring visual acuity, they have some limitations~~. ~~They do not measure peripheral vision, depth perception, color perception, or the ability~~ to ~~perceive contrast. They also do not measure~~ the ~~health~~ of the eye ~~itself~~.		Eye charts are typically used in a clinical setting. The patient is asked to cover one eye and read the smallest line of letters they can see clearly. This process is repeated for the other eye. The results are used to determine the patient's visual acuity, often expressed as a fraction, such as 20/20.

	== ~~See Also~~ ==		== Related pages ==
	* [[Visual acuity]]		* [[Visual acuity]]
	* [[Optometry]]		* [[Optometry]]
	* [[Ophthalmology]]		* [[Ophthalmology]]
			* [[Vision impairment]]
			* [[Corrective lens]]

	[[Category:~~Optometry]]~~		[[Category:Vision]]
	~~[[Category:Ophthalmology~~]]		[[Category:Medical equipment]]
	[[Category:Medical ~~tests~~]]

	~~{{stub}}~~
	~~{{dictionary-stub1}}~~

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2024-02-23T02:45:51Z

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'''Eye chart''' is a chart used by [[optometrists]] and [[ophthalmologists]] to measure [[visual acuity]]. Eye charts are often used in various [[healthcare]] settings, including clinics, hospitals, and schools.

== History ==
The first eye chart was developed by [[Herman Snellen]] in 1862. The [[Snellen chart]] is still in use today, although many other types of eye charts have been developed since then.

== Types of Eye Charts ==
There are several types of eye charts used in the field of [[optometry]] and [[ophthalmology]]. These include:

* '''[[Snellen chart]]''': This is the most commonly used eye chart. It consists of 11 lines of block letters, with the size of the letters decreasing as you move down the chart.

* '''[[LogMAR chart]]''': This chart is used for more precise measurements of visual acuity. It uses the same principle as the Snellen chart, but the letters are arranged in a logarithmic scale.

* '''[[Tumbling E chart]]''': This chart is used for people who cannot read, such as young children or illiterate adults. It consists of rows of the letter 'E' facing in different directions.

* '''[[Landolt C chart]]''': This chart is similar to the Tumbling E chart, but it uses a broken ring or 'C' instead of the letter 'E'.

== How Eye Charts Work ==
Eye charts work by measuring how well a person can see details at a specific distance. The person is asked to read the smallest line of letters they can see from a distance of 20 feet. The results are then expressed as a fraction, with the numerator being the distance the person was from the chart and the denominator being the distance at which a person with normal vision could read the same line.

== Limitations of Eye Charts ==
While eye charts are a useful tool in measuring visual acuity, they have some limitations. They do not measure peripheral vision, depth perception, color perception, or the ability to perceive contrast. They also do not measure the health of the eye itself.

== See Also ==
* [[Visual acuity]]
* [[Optometry]]
* [[Ophthalmology]]

[[Category:Optometry]]
[[Category:Ophthalmology]]
[[Category:Medical tests]]

{{stub}}
{{dictionary-stub1}}

Eye chart - Revision history

Prab: CSV import

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