Fig. 1. Soft lens versus rigid lens. Note the difference in diameter. The larger soft lens, which fits under the lid, is much less likely to be dislodged from the eye. (Stein HA, Freeman MI, Stein RM, Maund LD (eds): Basics of Soft Contact Lenses. In: Contact lenses: Fundamentals and Clinical Use, p 76. Thorofare, NJ, Slack, 1996)