If the inner surface of the eyelid or outer surface of the eye is not smooth, you will feel a foreign body sensation in your eye with each blink. This is because the inner and outer surfaces of the eye glide over each other whenever you blink. Contact lenses usually cover those irregular surfaces so that when you blink, you don't have a foreign body sensation. Retained foreign particles in the eye, dry eye disease, nodules, scarring, and corneal abrasions can also make you feel like something is in your eye. You need to seek medical advice from an ophthalmologist.