What are the normal reference values for children's vision screening instruments S and C?

Patient's question:

No

Doctor's answer:

Vision refers to the ability of the retina to resolve images. Normal vision for children is as follows:
One year: 0.2 - 0.25
Two years: 0.3 - 0.5
Three years: 0.6 - 0.7
Four years: 0.7 - 0.8
≥Five years: ≥1.0