Your local Police force should be able to tell you exactly what the requirements are. Why not give your regional Police Headquarters a call and ask to speak with someone from their recruitment dept - I am sure that they will be happy to oblige. Failing that , you could check with your optician , as they are usually familiar with the basic requirements. You haven't specified whether you are intending to apply to a Scottish Constabulary or the Metropolitan Police. I only know that contact lenses and glasses are now acceptable within Scottish Police forces - depending on how correctable the eyesight is with aided vision. Not sure about the Met. Good luck !