CONTACT LENS HEALTH WEEK: August 17-21 How do I know if I have a problem? When properly fitted and worn and looked after as instructed, contact lenses provide a very safe and effective means of vision correction. However, poor hygiene practices can result in a build-up of microbes and bacteria which can seriously affect your eye health and vision. If your eyes become red, sensitive to light, blurry or are otherwise uncomfortable while wearing your lenses, remove them immediately and visit us for expert advice.