Most people should have their eyes examined at least every two years, depending on their clinical circumstances. However, you should ask your optometrist how often they recommend you have an eye examination. If you notice any changes in your sight, or are having any problems with your eyes contact your optometrist do not wait for your next scheduled eye examination. Read more about eye examinations.
No. Although you may not be able to see very well with them and may get a headache or double vision, you wont come to any harm from wearing glasses that are not your prescription. However, you should only ever wear glasses that are your prescription when you drive.
If you have conjunctivitis you dont need to stay off work or keep your children out of school. But you should ensure that you avoid spreading the infection by making sure you wash your hands regularly with warm, soapy water, You should also wash your towels, face cloths and pillows regularly and dont let anyone else use them until you are symptom-free. If you usually wear contact lenses, dont wear them until your eyes are better.