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Updated: Aug 6, 2026
A Method to Quantify Visual Information Processing in Children Using Eye Tracking
Published on: July 9, 2016
Correlating preferential looking visual acuity and visual behavior in severely visually handicapped children
O Katsumi1, S G Chedid, J K Kronheim
1Children's Vision Center, Schepens Eye Research Institute, Boston, MA, USA.
Insights
Assessing visual function in young children with severe visual impairment requires evaluating their environmental interactions. Interest in activities like television correlates with better visual acuity, while nystagmus indicates poorer outcomes.
Area of Science:
- Ophthalmology
- Developmental Pediatrics
- Pediatric Vision Science
Background:
- Severely visually impaired children often present with functional deficits that are challenging to quantify.
- Retinopathy of prematurity is a common cause of visual impairment in this age group.
- Standardized visual acuity tests may not fully capture the functional vision of young children.
Purpose of the Study:
- To develop and validate a series of questions assessing functional visual abilities in severely visually handicapped children.
- To correlate these functional assessments with objective visual acuity measurements.
- To identify key visual behaviors indicative of visual function in this population.
Main Methods:
- A cohort of 100 children (30-60 months) with severe visual impairment, primarily due to retinopathy of prematurity, was studied.
- Visual acuity was measured using preferential looking tests.
- A questionnaire assessed children's interest in specific visual activities (e.g., television, toys, people) and correlated these with acuity measurements. Nystagmus presence was also recorded.
Main Results:
- Preferential looking visual acuities ranged widely (20/25 to 20/6400).
- Lack of interest in television, non-auditory toys, and people was significantly associated with very low visual acuities (p < 0.001).
- Children interested in television had significantly better visual acuity (mean 20/245) compared to those not interested (mean 20/2806). Patients with nystagmus (79%) had significantly lower visual acuities (mean 20/1114) than those without (mean 20/57).
Conclusions:
- Functional visual assessment through environmental interaction analysis is crucial for severely visually impaired children.
- Visual interest in stimuli like television can be a significant indicator of visual acuity.
- Combining preferential looking tests with behavioral observation provides a more comprehensive evaluation of visual function in young children with severe visual impairment.
Abstract:
We developed a series of questions that reflects the functional abilities of severely visually handicapped children. The study population comprised 100 patients aged 30 to 60 months (mean 43.23), mostly afflicted with retinopathy of prematurity. Visual acuity was measured by preferential looking. Preferential looking acuities of the patients ranged from 20/25 (0.8) to 20/6400 (0.003) (mean 20/470 (0.04)). Ten activities were analyzed and correlated with preferential looking acuity. Among the selected visual activities, when children are not interested in television (p = 0.0001), toys (other than those that make sounds (p = 0.0001), and people (p = 0.001)), their preferential looking acuities were very low. For example, 73 out of 100 patients who were visually interested in television had preferential looking acuities (mean 20/245 (0.082)) that were significantly higher (p = 0.001) than 21 patients not interested in television (mean 20/2806 (0.007)). Patients with nystagmus (n = 79) had significantly lower preferential looking acuities (p = 0.0001) (mean 20/1114 (0.018)) than patients with no nystagmus (mean 20/57 (0.35)). When evaluating visual function in young, severely visually impaired patients, in addition to preferential looking testing, analyzing visual behavior within the environment is important to accurately evaluate their remaining visual abilities.
