A contact lens is a corrective, cosmetic, ortherapeutic lens usually placed on the cornea of the eye. It has been estimated that 125 million people use contact lenses worldwide (2%), including 28 to 38 million in the United States and 13 million in Japan. A study reported in 2010 revealed increase in eye diseases like ulcers due to use of contact lens. Also, in 2010 complaints of abnormal pain, stinging, and irritation by use of contact lenses lead J&J to recall 100,00 boxes of 1-Day Acuvue TruEye. CooperVision, recently recalled Avaira Toric contact lenses due to presence residue on certain lots.
Why do people prefer contact lens?
People choose to wear contact lenses for many reasons, often due to their appearance and practicality. When compared with spectacles, contact lenses are less affected by wet weather, do not steam up, and provide a wider field of vision. They are more suitable for a number of sporting activities. Additionally, ophthalmological conditions such as keratoconus and aniseikonia may not be accurately corrected with glasses.
What advantage does hydrogels offer as contact lens material?
Silicone hydrogels have been approved and launched as a suitable material for contact lens. While it provides the oxygen permeability, silicone also makes the lens surface highly hydrophobic and less “wettable.” In order to compensate for the hydrophobicity, hydrogels are added (hence the name “silicone hydrogels”) to make the lenses more hydrophilic.
What are major complications due to contact lens?
Complications due to contact lens affect roughly 5% of contact lens wearers each year. Excessive use of contact lenses, particularly overnight wear, is associated with most of the safety concerns. Problems associated with contact lens use include, affect to the eyelid, conjunctiva, the various layers of the cornea, and even the tear film that covers the outer surface...
of the eye.
CooperVision continues recall of its Avaira Toric contact lenses
CooperVision has recalled 600,000 Avaira Toric contact lenses, in continuation its recall notice issued on Aug. 19 due to reported severe eye pain and hazy vision. The FDA confirms that it exchanged letters with CooperVision over the recall.
The company sent worldwide recall notifications to customers and to eye care providers, included lot-number information on its web site, established a toll-free consumer hotline, instructed retailers to send back all Avaira Toric products. Users can check to see whether their contact lenses are included in the recall by going to the Coopervision.com/recall web site or by calling 855-526-6737.
The company says the problem with the Avaira Toric lenses is due to “the unintended pesence of a residue on certain lots” of the lenses.
It has been advised to the users who experience problems with the lenses, should immediately stop wearing them and consult their eye-care provider. Recalled lenses can be returned for a refund at the place where they were purchased.