There is no evidence to suggest that wearing specs for a limited period actually alters or improves your eye sight. Short sightedness, or myopia, is caused by the shape of the eye - either the eyeball is slightly too long or the cornea (the clear covering of the front of the eye) is too steeply curved. Specs and contact lenses are able to correct the refractive error but not the cause, there are several methods however which can 'improve' your vision permanently which includes refractive surgery.If you would prefer not to wear specs, perhaps you should consider contact lenses. There are various lens types available which can be worn for varying lengths of time. Please visit your local optician who will be happy to advise you on the most appropriate contact lenses for your prescription and lifestyle and answer any other questions you may have.