Which vision screening result should be referred for further testing?

Which vision screening result should be referred for further testing?

• A. 4-year Snellen E chart: right eye 20/40; left eye 20/20
• B. 4-year HOTV chart: right eye 20/40; left eye 20/40
• C. 3-year Sjögren hand chart: right eye 20/40; left eye 20/20
• D. 3-year Allen chart: right eye 20/30; left eye 20/30

Answer: (C)

Understanding how to interpret preschool vision screening results hinges on using age-appropriate charts and looking for unilateral deficits that can signal risk for amblyopia or other eye conditions. In a 3-year-old, the Sjögren hand chart is a chart commonly used to estimate visual acuity. If the right eye shows 20/40 while the left eye is 20/20, there is a unilateral decrease in acuity that is not expected for a child this age on this chart. That difference suggests a potential problem such as refractive error, strabismus, or early amblyopia, and it warrants a referral for a comprehensive eye examination. The other scenarios involve results that are more consistent with age-appropriate expectations for the charts used or do not demonstrate a clear unilateral deficit for a 3-year-old. For example, results on charts used for older children or showing equal or acceptable acuity in both eyes do not meet the same threshold for urgent referral. The key point is the presence of a unilateral acuity drop to 20/40 in a 3-year-old when assessed with a chart designed for that age, which identifies a need for further evaluation.

Understanding how to interpret preschool vision screening results hinges on using age-appropriate charts and looking for unilateral deficits that can signal risk for amblyopia or other eye conditions. In a 3-year-old, the Sjögren hand chart is a chart commonly used to estimate visual acuity. If the right eye shows 20/40 while the left eye is 20/20, there is a unilateral decrease in acuity that is not expected for a child this age on this chart. That difference suggests a potential problem such as refractive error, strabismus, or early amblyopia, and it warrants a referral for a comprehensive eye examination.

The other scenarios involve results that are more consistent with age-appropriate expectations for the charts used or do not demonstrate a clear unilateral deficit for a 3-year-old. For example, results on charts used for older children or showing equal or acceptable acuity in both eyes do not meet the same threshold for urgent referral. The key point is the presence of a unilateral acuity drop to 20/40 in a 3-year-old when assessed with a chart designed for that age, which identifies a need for further evaluation.