Difference between revisions of Snellen chart

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# Make a mark on the floor at the distance the chart is rated for.

# Stand so that your face is above that line.

# Gently cover one eye (without actually touching it).

# Read the lowest line you can see clearly.

# Attempt to read the next line down.

# Have an assistant tell you if you got the letters right or move forward to check. If you got more than half of the letters right on that line, then the ratio marked for that line is your visual acuity.

# Have an assistant tell you if you got the letters right or move forward to check. If you got more than half of the letters right on that line, then the ratio marked for that line is your visual acuity. Record.

# Repeat steps 5-8 with the other eye covered.

# Repeat once more with both eyes together.

Please note: Unless you are in low myopia territory snellen measurements are intended to measure your vision with your distance correction.

Also important to know: Lighting will effect your results and due to the nature of the diopter bubble longer charts (6m/20ft) are more accurate than the short charts (3m/10ft), though both are perfectly acceptable methods to track vision trends over time.

==How to use a Snellen Chart with refraction==

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==Tools==

*[https://www.provisu.ch/images/PDF/Snellenchart_en.pdf Printable Snellen Chart 2.8m(9 feet)]

* [http://www.i-see.org/block_letter_eye_chart.pdf Block Letter Eye Chart with calibration measurement instructions 20feet/6meters)]

*[https://www.teachengineering.org/content/cub_/activities/cub_human/cub_human_lesson06_activity1_eyechart.pdf Printable Snellen Eye Chart (20 feet)]

* [http://www.i-see.org/etdrs/etdrs-1.pdf ETDRS Snellen version 1 20feet/6meters]

* [http://www.i-see.org/etdrs/etdrs-2.pdf ETDRS Snellen version 2 20feet/6meters]

* [http://www.i-see.org/etdrs/etdrs-r.pdf ETDRS Snellen version 3 20feet/6meters]

* [https://www.provisu.ch/images/PDF/Snellenchart_en.pdf Printable Snellen Chart 2.8m(9 feet)]

* [https://www.teachengineering.org/content/cub_/activities/cub_human/cub_human_lesson06_activity1_eyechart.pdf Printable Snellen Eye Chart 6m(20 feet)]

* [https://github.com/mminer237/denim-weasel Snellen chart generator]

* [https://eyes.arizona.edu/sites/default/files/eyechart.pdf Banner Eye Care Visual Acuity Test (BECVAT) V 2.0]

* Some people with astigmatism may use the [https://en.wikipedia.org/wiki/Stenopaeic_slit stenopaeic slit]<ref>https://community.endmyopia.org/t/francois-journey-to-20-20/10428/3</ref> as a measuring tool

* Alternatively, you can use an [http://www.i-see.org/astigmirror.pdf astigmatism mirror/fan] along with [https://endmyopia.org/diy-tools-how-to-measure-your-astigmatism-diopters/ this guide for estimating astigmatism].

==See Also==

* [[Astigmatism_measurement]]

* [[Guide:How to measure your eyesight]]

==References==

@@ Line 38: / Line 38: @@
 # Make a mark on the floor at the distance the chart is rated for.
 # Stand so that your face is above that line.
+# Gently cover one eye (without actually touching it).
 # Read the lowest line you can see clearly.
 # Attempt to read the next line down.
-# Have an assistant tell you if you got the letters right or move forward to check.  If you got more than half of the letters right on that line, then the ratio marked for that line is your visual acuity.
+# Have an assistant tell you if you got the letters right or move forward to check.  If you got more than half of the letters right on that line, then the ratio marked for that line is your visual acuity. Record.
+# Repeat steps 5-8 with the other eye covered.
+# Repeat once more with both eyes together.
+Please note:  Unless you are in low myopia territory snellen measurements are intended to measure your vision with your distance correction.
+Also important to know: Lighting will effect your results and due to the nature of the diopter bubble longer charts (6m/20ft) are more accurate than the short charts (3m/10ft), though both are perfectly acceptable methods to track vision trends over time.
 ==How to use a Snellen Chart with refraction==
@@ Line 46: / Line 54: @@
 ==Tools==
-*[https://www.provisu.ch/images/PDF/Snellenchart_en.pdf Printable Snellen Chart 2.8m(9 feet)]
+* [http://www.i-see.org/block_letter_eye_chart.pdf Block Letter Eye Chart with calibration measurement instructions 20feet/6meters)]
-*[https://www.teachengineering.org/content/cub_/activities/cub_human/cub_human_lesson06_activity1_eyechart.pdf Printable Snellen Eye Chart (20 feet)]
+* [http://www.i-see.org/etdrs/etdrs-1.pdf ETDRS Snellen version 1 20feet/6meters]
+* [http://www.i-see.org/etdrs/etdrs-2.pdf ETDRS Snellen version 2 20feet/6meters]
+* [http://www.i-see.org/etdrs/etdrs-r.pdf ETDRS Snellen version 3 20feet/6meters]
+* [https://www.provisu.ch/images/PDF/Snellenchart_en.pdf Printable Snellen Chart 2.8m(9 feet)]
+* [https://www.teachengineering.org/content/cub_/activities/cub_human/cub_human_lesson06_activity1_eyechart.pdf Printable Snellen Eye Chart 6m(20 feet)]
+* [https://github.com/mminer237/denim-weasel Snellen chart generator]
+* [https://eyes.arizona.edu/sites/default/files/eyechart.pdf Banner Eye Care Visual Acuity Test (BECVAT) V 2.0]
+* Some people with astigmatism may use the [https://en.wikipedia.org/wiki/Stenopaeic_slit stenopaeic slit]<ref>https://community.endmyopia.org/t/francois-journey-to-20-20/10428/3</ref> as a measuring tool
+* Alternatively, you can use an [http://www.i-see.org/astigmirror.pdf astigmatism mirror/fan] along with [https://endmyopia.org/diy-tools-how-to-measure-your-astigmatism-diopters/ this guide for estimating astigmatism].
+==See Also==
+* [[Astigmatism_measurement]]
+* [[Guide:How to measure your eyesight]]
 ==References==