Bifocal safety glasses metal frame with proper powers

It is estimated by the National Institute of Occupational Safety and Health that there are about 2

,000 individuals in the United States suffering workplace eye injuries every day. Most of them are serious enough to require medical interference. This big concern causes safety eyeglasses to be a necessity for those involved workers. There can be flying debris striking an unprotected eye. And a worse case can be chemicals or liquids splashing the eyes. In addition, for individuals who have presbyopia, it is necessary to wear bifocal reading glasses in order to get convenient changes between near and distance vision. Superior to single vision reading glasses, bifocal reading glasses have maintained a large number of users during the past decades. The combination of the mentioned two groups of individuals has called for the invention of bifocal safety eyewear. These combinational eyeglasses can meet both of the two requirements, namely, eye protection and presbyopia correction. There are some important aspects associated with those bifocal safety glasses. Assessing possible frame materials, there are bifocal safety glasses metal frame and bifocal safety glasses zyl frame. As corrective eyewear, bifocal safety glasses still need to be made with personal prescription. As mentioned before, eye protection is one of the two fundamental properties or capabilities of bifocal safety glasses. Similar to regular protective goggles, bifocal safety eyeglasses need to be strong enough to resist most of the penetrating objects, such as a flying tiny stone. Protective lenses are not competent enough if they can only block those splashing chemicals or liquids. Encountering solid objects, bifocal safety glass lenses should also be resistant enough. However, the lenses are actually one of parties fighting against external impact. The frame should also durable and strong enough to hold stably the lenses being attacked. Otherwise, a fragile frame encompassing the lenses would probably cause more serious consequences when there is a penetrating solid object. In fact, the American National Standards Institute (ANSI) has set strict rules that all portions of a prescription safety eyeglass frame must be permanently marked with the stamp Z87-2. With such a requirement, most of the protective eyeglass frames are made from zyl or metal. Moreover, bifocal safety glasses metal frame also need to be prescribed with exact powers according to personal visual condition. This is actually the other property of bifocal safety glasses discussed above. Currently, most manufacturers only produce bifocal safety glasses with diopters between +1.0 and +2.5. Individuals who have higher prescriptions need to buy customized glasses, which are usually more expensive.

Bifocal safety glasses metal frame with proper powers

By: yujie

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