‘A light-sensitive lens and an ultraviolet emitting device can improve vision following cataract surgery in patients with astigmatism.’The special light delivery device can make small corrections to the power of the implanted lens in the clinic without the need for a repeat surgery. The ultraviolet light from the device changes the implanted lens based on inputs from the patient, thus changing its refractive power and improving vision. The device is useful in patients with pre-existing astigmatism of ≥ 0.75 diopters, without a macular disease.Astigmatism is a type of refractive error due to an irregular shape of the cornea.
The device was tested in a clinical trial conducted on 600 individuals who had undergone surgery for cataract and were implanted either the special lens or conventional intraocular lens. Six months following the surgery, improvements in vision were noted on an average in patients who received the ultraviolet light-sensitive lens as compared to those who received a conventional intraocular lens.
The device should however not be used in individuals in patients with a history of herpes simplex affecting the eye or in those taking medications that increase the sensitivity to ultraviolet light; these include chloroquine, hydrochlorothiazide, the antibiotics tetracyclines and lomefloxacin, psoralens, amiodarone, phenothiazines, hypericin, the non-steroidal painkillers ketoprofen and piroxicam, and methoxsalen.
"Until now, refractive
errors that are common following cataract surgery could only be corrected with
glasses, contact lenses or refractive surgery. This system provides a
new option for certain patients that allows the physician to make small
adjustments to the implanted lens during several in-office procedures after the
initial surgery to improve visual acuity without glasses," Malvina
Eydelman, M.D., director of the Division of Ophthalmic, and Ear, Nose and
Throat at the FDA's Center for Devices and Radiological Health.
Reference:FDA approves first implanted lens that can be adjusted after cataract surgery to improve vision without eyeglasses in some patients - (https:www.fda.gov/NewsEvents/Newsroom/PressAnnouncements/ucm586405.htm)Source: Medindia
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