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What is an eye chart?
Used by eye doctors to measure the vision of a patient and compare it to the chart. The different types of eye charts include the Snellen eye chart, the tumbling E eye chart, and the Jaeger eye chart.
The Snellen eye chart
It was developed by Herman Snellen. It is a classic example containing 11 rows of capital letters which get smaller. When a patient is getting an eye exam, they are asked to find the smallest line of letters they can read and read it out loud. Your visual acuity is excellent if you can read letters at the bottom row.
“Tumbling E” eye chart
This test is a …

An astigmatism test is done during an all-inclusive eye exam by your doctor. Astigmatism symptoms include headaches, eye strain, and distorted vision.
To check for astigmatism, the tests below are performed:

Refraction: In an eye exam, there are two types of refraction. They are manual and automated refraction.
Visual Acuity Test: An eye chart is used to test your visual acuity with or without your current lenses. It determines how severe your astigmatism is.
Keratometry: It involves measuring your cornea curvature to perceive unequal curves in various meridians of the cornea. A Keratometer instrument …

Professionals who specialize in the care of eyes recommend eye checks once between one to two years. It may depend on your age, use of corrective lenses, and risk factors. Although screening is done in schools, it’s not a substitute for comprehensive eye checkups that can point out the underlying causes of vision problems.
Children’s Eye Exam Frequency
Regular eye exams are essential for children to detect vision problems that may influence their learning. Professionals recommend a first eye check-up at 6 months, at age 3, and before joining grade one. Those without risk factors can have yearly exams until age 18, …