rimless frames are the least noticeable type, and they are lightweight because the nosepiece and temples are attached directly to the lenses, eliminating the weight of the rims. they tend to lenses not be as sturdy as frames with rims, so they are not a good choice for people who frequently remove their glasses and put them on again. they are also not very suitable for lenses that correct a high degree of farsightedness, because such lenses are thin at the edges.metal frames are less noticeable sfx than plastic, and they are lightweight. they are available in solid gold, gold-filled, anodized aluminum, nickel, silver, stainless steel, and now titanium and titanium alloy. until the late theatrical 1980s, when titanium-nickel alloy and titanium frames were introduced, metal frames were, in general, homony more fragile than plastic frames. the titanium frames, contact however, are very strong and lightweight. an alloy of titanium and nickel, lenses called flexon, is not only strong and lightweight, but returns to its original shape after being twisted or dented. it is not perfect for everyone, though, because some people are sensitive to its nickel. flexon frames are also relatively expensive.

rimless frames are the least noticeable type, and they are lightweight because the nosepiece and temples are attached directly to the lenses, eliminating the weight of the rims. they tend to lenses not be as sturdy as frames with rims, so they are not a good choice for people who frequently remove their glasses and put them on again. they are also not very suitable for lenses that correct a high degree of farsightedness, because such lenses are thin at the edges.metal frames are less noticeable sfx than plastic, and they are lightweight. they are available in solid gold, gold-filled, anodized aluminum, nickel, silver, stainless steel, and now titanium and titanium alloy. until the late theatrical 1980s, when titanium-nickel alloy and titanium frames were introduced, metal frames were, in general, homony more fragile than plastic frames. the titanium frames, contact however, are very strong and lightweight. an alloy of titanium and nickel, lenses called flexon, is not only strong and lightweight, but returns to its original shape after being twisted or dented. it is not perfect for everyone, though, because some people are sensitive to its nickel. flexon frames are also relatively expensive.

eye glasses and contact lenseses and contact are devices that correct refractive errors in vision. lenses lenses are sfx mounted in frames worn on the face, sitting mostly on the ears and nose, so that the lenses are positioned in front of the eyes. contact appear to be worn in direct contact theatrical with the cornea, homony but they contact actually float on a layer of tears that separates them from the cornea.purposethe purpose of lenseses and contact is to correct or improve the vision lenses of people with nearsightedness sfx (myopia), farsightedness (hyperopia), presbyopia, and astigmatism.precautions people allergic to certain plastics should not wear contact or lenses frames or lenses manufactured from that type of plastic. people allergic to nickel should not wear flexon frames. people at risk of being in accidents that might shatter theatrical and homony glass lenses should wear plastic lenses, preferably polycarbonate.