India, Sept. 21 -- When was the last time you got your eyes checked? For most of us, we get our eye prescriptions updated when we want to change the frames. But according to Dr Sujal Shah, director, ophthalmology, Sir HN Reliance Foundation Hospital, Mumbai, this delay may be doing more harm than good.

Your glasses sit on your face for months, but that does not automatically mean that you need a new pair. What matters most is not the age of your glasses, but whether your prescription has changed. If it has, Dr Sujal stressed that continuing to use an old prescription can make it harder to see clearly.

But how can you know that it is time to change your glass lenses? According to Dr Sujal, the first sign is usually something quite simple...