The mother of the 5-year-old child found that the child watched the TV station very close, and the children's books were also pasted very close. The child had no previous ophthalmic examination, and had no obvious systemic disease and medication history. The inspection results are as follows:

Ophthalmic examination: there is no organic disease in the eye

Naked far vision: OD:0.3 OS:0.25

Naked near vision: OD: 0.25 OS: 0.15

Far eye position: 10 △ ESO

Near eye position: 10 △ ESO

Cycloplegia optometry:

OD：+8.00DS/+1.00DCX90     0.4

OS:  +8.50DS/+1.00DCX90     0.3

Worth 4-point examination: no inhibition in both eyes

Binocular stereopsis: None

Fixation nature: central fixation

The preliminary diagnosis of this child is typical ametropic amblyopia