Contact lenses are a popular alternative to glasses, and in this episode of A State of Sight, Isaac Porter, MD discusses four primary types of contacts: soft contacts, toric contacts, multifocal contacts, and rigid gas permeable contact lenses. Soft contacts are the most commonly used type. Soft lenses are generally replaced every 2 or 4 weeks, but daily disposable lenses are available as well. Toric contact lenses correct for astigmatism. These lenses are usually used in patients with medium to large amounts of astigmatism, since small amounts of astigmatism are very common and only mildly affect vision. Multifocal contact lenses are available for patients over age to give a range of vision from near to far without needing to use reading glasses. Monovision is a great alternative to multifocal lenses and is discussed in detail in episode #34 of A State of Sight. Rigid gas permeable contacts are made of hard plastic and can provide the best clarity of vision in patients with large amounts of astigmatism or corneal problems like keratoconus. Although some soft contacts are approved for overnight wear up to 30 days, we never recommend this to our patients. Overnight or extended wear can give a 400% greater chance of an eye infection or corneal ulcer, which could cause permanent vision loss. Have any questions or comments about contact lenses? Please post! More info on monovision in A State of Sight #34: : www.youtube.com/watch?v=Iv7r78N25bM&feature=share&list=UU8mvwe5zVm1BHNJH56YI5ow eyeporter.com facebook.com/eyeporter twitter @eyeporter

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