Hi Priyanka,Since you have difference of power in both eyes there are high chance of image disparity between two eye which may be causing the problem.One more thing is that you haven't mentioned your vision after wearing the glass.If you had power since childhood and you have worn a glass at the age of 21 ie 5 yrs ago as mentioned, then you may have developed amblyopia
in your left eye which has little high power(-1.5D). So this left eye is a nondominat eye and your right eye is a dominant eye.The sharpness of image will be more in Rt eye.If you have astigmatism
in left eye and not using a properly prescribed glass then also you will have less sharp image in your left eye.This maynot be a nerve related problem unless you suffer from glaucoma
.But still I would advise you to repeat refraction
and do proper retinoscopy
to re check your glass prescription, and do a fundus exam to rule out any retinal or nerve pathology. If every thing is normal then you don't need to worry. Do a yearly check up after that .Your eye sight can only be improved with glass , CLor Laser treatment
. Depending on your requirements you can choose what you want....Tc Bye...Dr Ajay Shankar Kar, cornea
consultant, Sankar foundation eye hospital,Vizag.