Age-related changes in children’s threshold exposure duration for recognition of test objects

V.I. Serdiuchenko, Dr Sc (Med)

M.B. Zheliznik, Graduate Student

Filatov Institute of Eye Diseases and Tissue Therapy, NAMS of Ukraine

Odessa, Ukraine

E-mail: virais@ukr.net

Background: Timely detection of an object in the visual field is of primary importance to adults and children.

Purpose: To investigate threshold exposure duration for recognition of test objects (TEDRTO) in normal vision children of various age groups.

Materials and Methods: Four hundred and sixteen children (832 eyes; age, 5 to 17 years) with a refraction within the age norm (emmetropia or hyperopia of up to 1.0 D) were included into the study and underwent assessment of TEDRTO with a special electronic apparatus. The apparatus was used to expose a test object (an illuminated Landolt’s ring subtending 8 minutes of arc) against a black background.

Results: In children of 5 to 6 years, 7 to 10 years, 11 to 14 years, and 15 to 16 years, binocular threshold exposure durations for recognition of the white test object subtending 8 minutes of arc were found to be 2.1 ± 1.3 ms, 1.4 ± 0.5 ms, 1.1 ± 0.3 ms and 1.1 ± 0.3 ms, respectively.

Conclusions: The results obtained can be used as reference values while investigating threshold exposure durations for recognition of test objects in various disorders of the visual system.



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