Cure lens specifications color blindness
Blind glasses experience - comparison information to sleep masks
A glasses is a construction worn in front of the eyes that corrects ametropia and positional errors of the eyes in the majority of cases as an optical aid and as such Prescription glasses or Corrective glasses is called. In addition, glasses are used to protect against external influences, injuries or overstimulation as well as for therapeutic, diagnostic and experimental purposes. Glasses are also important as a fashion accessory.
A pair of spectacles consists of spectacle lenses that either have a refractive effect as ground lenses and serve as visual aids, or of cast panes or glasses made of different materials that can serve different purposes. It also has a for stabilizing and fixing the lenses Versionwhich can consist of different materials, sizes and shapes, as well as a Holding device (Ear hook, handle or behind-the-head strap).
Today's glasses manufacture is based on standards and guidelines. Often, opticians manufacture the end product from components that are usually industrially or manually prefabricated and deliver the finished glasses to the customer. The necessary glass thickness is determined beforehand, usually by an optician or an ophthalmologist. In Germany, around 64% of people over the age of 16 and around 15% of children need corrective glasses. In Germany, glasses have been paid for by the statutory health insurance companies in simple designs since the 1930s. Visual aids are still in List of resources of the statutory health insurances (GKV). However, the costs for their production are only covered with considerable restrictions.
Corrective glasses were invented as reading glasses in Italy at the end of the 13th century (around 1285), but magnifying optical aids have been known since ancient times.
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