Doctor insights on:
Polycarbonate Vs Plastic Eyeglass Lenses
Probably polycarb: Polycarbonate lenses are "high index" lenses. They are often used in high myopes to allow for the glasses to be thinner and lighter. They do have more chromatic aberration though. Discuss the various pros and cons with your optician before deciding what it right for you.
No: I wouldn't worry too much about that. Do clean if off thoroughly before using.
A little more: Polycarbonate lenses have a higher index of refraction and can be made a little thinner which lightens the eyeglasses and makes them more comfortable. So they charge a little more for them. I consider eyeglass costs way too high for the technology and manufacturing costs, but it is an industry charging what the public will put up with.
Safety glasses.: Polycarbonate (a type of plastic) in cetain thicknesses and specifications, is the type of material used in most industrially used safety glasses. It is reputed to be able to stop a speeding bullet (depends on the speed and type, of course)! most high-index eyeglass lenses these days are made of alternate material with better optic quality than polycarb.
I have a crack a polycarbonate eyeglass lens starting at the edge. What would happen if hit by ball?
Not easily: Scratches in polycarbonate lenses involve the removal of plastic in the scratch. To smooth it out you would need to grind this away which would alter the power of the lense and might induce some distortion. Check with an optical shop to see if some correction is possible or replacement is needed.
No: There are other materials which can be used, trivex for example.
I accdently shallowed a small piece of plastic that may have been polycarbonate plastic it was smaller than a dime I think. Will I die?
Not likely: Polycarbonate plastic is inert. With relatively small size of dime, it can usually passes through the gastrointestinal tract without overt risk of obstruction within 24 to 72 hours. However, in rare circumstances, the object can cause obstruction if a person has per existing congenital abnormality, such as achalasia, pyloric stenosis, or other intestinal or colonic stricture.See 2 more doctor answers
See below: Take them to your optician and ask. They will be able to help you.
Snap and crack: For the same size lens Plastic is heavier. Polycarbonate will be uv400. For those 2 you probably can't tell. Plastic snaps or shatters went bent past tolerance, polycarbonate just bends and then past tolerance will not resume its original shape. Plastic is typically cheaper but has better optical quality
Heard that glass lenses for eyeglasses are somehow superior to plastic or composite lenses. Any truth to this?
Mixed choice: Glass lenses are more resistant to scratches but they are heavier (on the nose). Plastic is lighter but tends to collect scratches. In good condition, they both provide excellent focus.See 1 more doctor answer
Generally not: The plastic lenses of eyeglasses from reputable dealers will not be damaged by rubbing alcohol although some frames might be susceptible. Lenses from ordinary retail sources might be made of cheaper plastic and be damaged. However it is always best to clean the lenses with a microfiber cloth and use dish soap if the soil is heavy.
Polycarbonate: Polycarbonate is a shatter-resistant plastic that is used in all children's glasses and in safety glasses. It is also used for certain types of glasses frames because of its toughness.
No: And they will be lighter and easier on the nose.
Yes: These are high index eyeglass lense materials which allow a thinner eyeglass and for a given power of lens, are lighter than glass or ordinary plastics. This is helpful to the nose which would otherwise have to support a heavier lense.
I was wondering what are the differences between polycarbonate, polycarbonate aspheric, and 1.67 high index lens?
Lens materials: Polycarbonate and 1.67 high index are different types of plastics used to make lenses for glasses. Aspheric is a type of lens design. Generally the higher index of the plastic, the thinner the lens can made. Higher index materials may induce more distortion in the periphery of the vision.
Not related: Polycarbonate refers to the material that a lens is made from. Sphericity relates to the way the lens is ground.
No: Polycarbonate is simply a type of plastic. Things that can help include tints, anti-reflective coatings, glare filters on your monitor and adjustments of lighting. Some people also benefit by changing the color settings on their monitors and sitting further away from the screen. Lubricating eye drops are beneficial and, of course, frequent breaks.See 1 more doctor answer
Plastic: High index plastic (high prescription) higher refractive index, then thinner polycarbonate (impact resistant if monocular) glass is rare now.See 1 more doctor answer
Polycarbonate: Current ansi standards recommend the use of polycarbonate in safety glasses for work use. Hardened glass was the precursor.
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