A clinical test of dynamic visual acuity for children

Area of Science:

• Pediatric audiology and ophthalmology
• Vestibular and visual system interaction

Background:

• Children with sensorineural hearing impairment and vestibular hypofunction often have gaze stability deficits impacting reading.
• Developing a reliable clinical test for dynamic visual acuity (DVA) in children is crucial.

Purpose of the Study:

• To develop and validate a clinical test for dynamic visual acuity (DVA) in children.
• To assess the reliability and validity of the DVA test for identifying children with vestibular deficits.

Main Methods:

• Visual acuity was tested in typically developing children and those with sensorineural hearing impairment under static and dynamic head movement conditions (horizontal and vertical).
• A dynamic acuity score was calculated by comparing static and dynamic visual acuity.
• Normative data were used to establish pass/fail criteria based on standard deviations from the mean.

Main Results:

• The horizontal dynamic acuity (hDVA) test demonstrated excellent test-retest and inter-tester reliability.
• The hDVA test showed 100% sensitivity and specificity in identifying children with bilateral vestibular hypofunction (BVH).
• The vertical dynamic acuity test was not well-tolerated by children, limiting its clinical utility.

Conclusions:

• The clinical horizontal dynamic acuity test is a reliable, simple, and inexpensive tool for children aged three and older.
• This test can effectively identify children who may require further vestibular or audiological evaluation.