Abstract:

Objective To investigate the relationship between geometric form perception and refractive status of students in urban areas of central China. Design Cross-sectional study. Participants 2267 students in grade 7 in Anyang of Henan Province were included, in which 2112 students completed cycloplegia optometry and 1701 patients completed geometrical form perception testing. Method The four stimulus arrays were applied to measure the relative salience of the different levels of geometrical invariants namely euclidean, affine, projective, topological invariants. Ophthalmic examination including slit lamp examination, distance visual acuity, vertometer, cycloplegic autorefraction, ocular biometry was also conducted. Main Outcome Measures Average response speed of geometric form test. Result The average perceptual speed for euclidean, affine, projective, topological and baseline invariants in subjects are respectively 1.97±0.67 s, 1.92±0.60 s, 1.44±0.56 s, 0.82±0.18 s, 0.69±0.14 s (F=5.82, P=0.0032). Students with glasses were faster than those without glasses in euclidean (1.93±0.61 s, 2.00±0.71 s), affine (1.88±0.59 s, 1.94±0.60 s), and projective (1.39±0.43 s, 1.47±0.63 s) detection (all P<0.05). The hyperopia group than the myopia group responded slower in projective (1.53±0.54 s, 1.42±0.53 s) and topological (0.85±0.19 s, 0.80±0.18 s) detection (all P<0.05), while non significant difference was found in euclidean and affine detection among three groups. Conclusion Adolescents with spectacles in central China have stronger perceptive ability of geometrical form than those without spectacles, while hyperopic adolescents tend to have stronger perceptive ability of geometrical form than myopic adolescents. (Ophthalmol CHN, 2019, 28: 249-253)

Key words: early topological perception, children and adolescents, form perception, refractive error