Noise sensitivity may develop as a result of an abnormality in the middle or inner ear. Trauma to the ear may cause noise sensitivity. Noise sensitivity may be present with migraine headaches. Noise sensitivity may occur as a side effect of certain medications. Noise sensitivity may occur as a result of an ear infection. People with misophonia find it impossible to tolerate certain sounds.
Equal division lenses, segmented bifocals and blended lenses â also called seamless or invisible bifocals â are three main types of bifocals. Equal division bifocal glasses feature lenses cut in two distinct halves, with the magnification part on the lower half and the long-distance lens on the upper half. The initial version of the equal division lenses, called the executive cut, had a visible horizontal line directly across the lens.
Progressive lenses are the most exciting and technologically advanced spectacle lenses available. If you're a 40-something who has trouble reading fine print, you have more lens options than the old lined bifocals your parents wore. Progressive lenses, sometimes called no-line bifocals, are multifocal lenses that eliminate the lines of a bifocal or trifocal lens.