Step 1 of the visual function analysis: to see if the distant and near eye positions are consistent; Step 2 of the visual function analysis: to find if the problem eye position is in the distance or near; Step 3 of the visual function analysis: to find if the corresponding resistance strength of the problem eye position is sufficient; Step 4 of the visual function analysis: to see the AC/A value; Step 5 of the visual function diagnosis: to see if the abnormal eye position affects the accommodation; Step 6 of the visual function diagnosis: to see if the accommodation abnormality is primary or caused by the collection abnormality; Step 7 of the visual function diagnosis: to see if the accommodation affects the refraction; Step 8 of the visual function diagnosis: to give the eye an appropriate correction plan.