If you notice a gradual loss of visual acuity in one or both eyes, colors becoming paler, contrasts weaker, and you are increasingly sensitive to glare (e.g., from the headlights of oncoming cars or the low-lying sun), then this could be due to cataracts. Sometimes, the thickening and hardening of the eye lens can change your visual acuity, making you nearsighted, or reducing farsightedness, allowing you to read without glasses again. As soon as you notice these signs – or even better, regularly once a year – you should visit your ophthalmologist for an examination.