Saturday, May 28, 2011

Eyeglass and Contact Lens Problems

Glare and halos are a common and annoying problem for a good number of eyeglass and contact lens wearers according to the global NSIGHT (Needs, Symptoms, Insight, Global Eye Health Trends) study. Halos are the appearance of rings around sources of light while glare is the difficulty seeing in the presence of bright light. The majority of patients who experienced these symptoms reported they were most likely to experience halos or glare in the evening or late at night. The symptoms were commonly associated with bright lights, headlights, being in the dark and nighttime driving.

NSIGHT, which was gathered from 3,800 eyeglass and contact lens wearers data, uncovered how often and to what degree patients experience glare and haloes, as well as how disturbing these visual symptoms and problems are for patients. The data demonstrated the following:
  • About half of the spectacle and contact lens wearers surveyed reported suffering from the symptoms of halos (52% and 56%, respectively) and glare (47% and 50%, respectively) more than three times a week; 
  • More than four out of five patients who experienced these symptoms found each symptom bothersome (84% and 89% for halo and glare, respectively); 
  • Spherical aberration, which can contribute to optical distortions in the visual system, can create halos and glare. Spherical aberration is a type of image blur caused by light rays striking the lens periphery where they are bent too much -- over refracted -- compared with rays coming through the center of the lens.
The NSIGHT study findings indicated that the severity of symptoms associated with halos and glare is sufficient enough to impact patient satisfaction with the usual vision correction methods, such as eyeglasses and spectacles, and patients expressed an interest in an intervention that more adequately addressed these symptoms.

Top LASIK surgeons have been routinely measuring both high and low order optical aberrations such as spherical aberration, and offering patients Wavefront Guided Laser Eye Surgery or Custom Wavefront Optimized LASIK to reduce and correct spherical aberration for LASIK Surgery patients.

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