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The forced-choice preferential looking method (FPL) shows the development of acuity during the first year of life, and is applicable to clinical assessment. A tracking test using a narrow strip of grating yields a more sensitive measure for the later part of this age range, however. The development of acuity is dominated by neural rather than optical or accommodative factors. By age 3 years resolution acuity is very close to adult performance, but at 5 years 'crowding' effects may still impair performance on practical acuity tasks more than for the adult.


Journal article


Acta Ophthalmol Suppl

Publication Date





18 - 26


Adult, Age Factors, Cataract, Child, Preschool, Female, Humans, Infant, Male, Refractive Errors, Vision Tests, Visual Acuity