Vision Screening Online Training Program - Visual Acuity

Vision Screening Online Training Program

Module 6: Distance Visual Acuity
(C&TC: Usually performed by a nurse or medical assistant)

Vision screening is most often associated with the visual acuity screening portion, which is performed with eye charts. The purpose of visual acuity screening is to test for refractive errors in a child's sight; specifically to screen for myopia, amblyopia, astigmatism, and anisometropia. Research has revealed that conditions such as strabismus and amblyopia often present with refractive errors making visual acuity screening a means for picking up amblyogenic and strabismic risk factors.

Near-sightedness (myopia) is most commonly detected between the ages of 8 and 12 years [6]. However, children may start developing refractive errors at a young age, can impact learning ability. For this reason, it is important that visual acuity screening is performed consistently starting at the age of three.

Recommended Charts
There are 4 different charts recommended for screening by the Minnesota Department of Health. These include the 10 foot LEA SYMBOLS ® or HOTV Letters charts, MASS Vat flip chart, and the 10 foot Sloan Letters chart (LogMAR also known as proportional chart). These acuity charts are used for different populations. For instance, the 10 foot LEA SYMBOLS ® and HOTV charts are best used for children 3 through 5 years of age. The 10 foot LEA SYMBOLS ® and HOTV are also useful for children that have not yet learned the English alphabet. In contrast, the 10 foot Sloan letters chart, is best used when the child being screened is literate or at least knows their letters. Sometimes younger children have difficulty using wall charts with multiple lines, which is why a visual acuity flip chart is recommended as an alternative for children 3 through 5 years of age.

Questions and Answers Regarding Visual Acuity Screening

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