I have been workin 10:00-5:00 p.m. since 20-25 days and from few days , a week or more every evening I come back i can't recognise faces like it seems blurry though the area i live in is little dim too but i find it difficult to see faces from not so far. Also I have 0.5 and 0.75 power spectacles and i wear them only when i work i.e before i leave office. So is this normal strain or i should be worried