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 not be as sturdy as frames with rims, so they are not a good choice for people who frequently remove their sfx 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 than plastic, and they are lightweight. they are available in solid gold, gold-filled, anodized aluminum, nickel, silver, stainless steel, and now titanium theatrical and titanium alloy. until the late 1980s, when titanium-nickel alloy and titanium frames were introduced, metal frames were, disco in general, more fragile than plastic frames. the titanium frames, however, are very strong and lightweight. an alloy of titanium and nickel, called flexon, is not only strong and lightweight, but returns to its original shape after being twisted or dented. it is not contacts 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 not be as sturdy as frames with rims, so they are not a good choice for people who frequently remove their sfx 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 than plastic, and they are lightweight. they are available in solid gold, gold-filled, anodized aluminum, nickel, silver, stainless steel, and now titanium theatrical and titanium alloy. until the late 1980s, when titanium-nickel alloy and titanium frames were introduced, metal frames were, disco in general, more fragile than plastic frames. the titanium frames, however, are very strong and lightweight. an alloy of titanium and nickel, called flexon, is not only strong and lightweight, but returns to its original shape after being twisted or dented. it is not contacts perfect for everyone, though, because some people are sensitive to its nickel. flexon frames are also relatively expensive.

the distance between the lenses is for a "standard" person. generally, sfx this will not be a problem, but if a patient is sensitive or has more closely set eyes, for example, it may pose a problem. persons buying ready-made sunglasses or reading glasses should hold them up to see if they appear clear. they should also hold the lenses to see an object with straight lines reflected off of the lenses. if the lines don''t appear straight, the lenses may be warped or inferior.patients may sometimes need a few days to adjust to a new prescription; however, problems should be reported, because the glasses may need to be rechecked.contact