单项选择题
A．near-sighted B．far-sighted C．astigmatic D．suffering front cataracts
A．have a curable disease in their eyes B．have eyes that are not exactly the right shape C．have a difficulty that can be corrected by an operation D．have an eye difficulty that cannot be corrected by glasses
A．seeing at night B．seeing objects far away C．looking over a wide area D．judging distances