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Adjustable focus eyeglasses are eyeglasses with an adjustable focal length. They compensate for refractive errors (such as presbyopia) by providing variable focusing, allowing users to adjust them for desired distance or prescription, or both. Current bifocals and progressive lenses are static, in that the user has to change their eye position ...
Seniors over 65 and already enrolled in Medicare (original and the private plans are covered below) can enroll in different plans during the 2013 Medicare Annual Open Enrollment Period, which runs ...
These ED pills are an effective treatment option for men 65 and older. Tadalafil . Tadalafil is the active ingredient and generic version of Cialis. It’s a longer-lasting ED medication that can ...
For every two hours of sitting to watch TV, study participants had a 12% drop in the odds that they would age in a healthy way. However, the study also found that having two additional hours of ...
Progressive lenses are corrective lenses used in eyeglasses to correct presbyopia and other disorders of accommodation. They are characterised by a gradient of increasing lens power, added to the wearer's correction for the other refractive errors. The gradient starts at the wearer's distance prescription at the top of the lens and reaches a ...
In binoculars with Schmidt–Pechan or Uppendahl roof prisms, mirror coatings are added to some surfaces of the roof prism because the light is incident at one of the prism's glass-air boundaries at an angle less than the critical angle so total internal reflection does not occur. Without a mirror coating most of that light would be lost.
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