Recognition acuity, grating acuity, contrast sensitivity, and visual fields in 6-year-old children

Area of Science:

• Ophthalmology
• Pediatric Optometry
• Visual Neuroscience

Background:

• Establishing normative visual function data in children is crucial for identifying potential developmental issues.
• Previous studies have provided some data, but comprehensive assessments across multiple visual parameters in specific age groups are ongoing.

Purpose of the Study:

• To measure monocular distance visual acuity (VA), grating acuity, contrast sensitivity, and visual field extent in healthy, full-term, 6-year-old children.
• To compare these visual function parameters in children to adult norms.

Main Methods:

• 59 healthy 6-year-olds underwent comprehensive eye examinations, including cycloplegic refraction, to exclude ocular abnormalities and refractive errors.
• Monocular testing included recognition acuity (Early Treatment Diabetic Retinopathy Study charts), grating acuity (Teller acuity cards), contrast sensitivity (Pelli-Robson charts), and visual field extent (white-sphere kinetic perimetry).

Main Results:

• Mean values for the right eye were 0.040 logMAR for VA, 24.5 cycles per degree for grating acuity, and 1.63 log units for contrast sensitivity.
• Mean visual field extent varied by meridian, with the inferonasal at 59.1°, superonasal at 57.8°, superotemporal at 71.2°, and inferotemporal at 100.4°.

Conclusions:

• The study provides valuable normative monocular visual function data for 6-year-old children.
• Children's thresholds were lower than adults for distance recognition VA, grating VA, and contrast sensitivity, but similar for visual field extent.