If the child cries for only a short time, the results of the vision test afterward are also accurate and will not be affected too much; however, if the child cries for a long time, the accuracy of the vision test may be reduced. If a child cries for a short period of time, the vision test will not be affected, and the eye axis will not change, so the test results afterward will be more accurate and generally will not be affected too much. If prolonged crying leads to dry eyes, red eyes, or a sudden feeling of blurriness in the eyes, it may affect the vision test results, because if the vision test is done when the eyes are not clear, the value of the vision measured will also drop and not be able to measure the true level. If the child is currently crying, it is recommended to go back to the hospital for a vision test after a half-hour interval, which usually does not interfere with the diagnostic results.