The study revealed that the Lea symbols chart provided an accurate and sufficient assessment in 95.9 % of the 149 preschool - age children tested .
The study compared visual acuity diagnoses from Lea symbols tests to those obtained via ophthalmological examination .
The study , which compared visual acuity diagnoses from Lea symbols tests to those obtained via ophthalmological examination , revealed that the Lea symbols chart provided an accurate and sufficient assessment in 95.9 % of the 149 preschool - age children tested .