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. ...Read more
No: I wouldn't worry too much about that. Do clean if off thoroughly before using. ...Read more
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. ...Read more
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. ...Read more
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. ...Read more
No: There are other materials which can be used, trivex for example. ...Read more
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. ...Read more
See below: Take them to your optician and ask. They will be able to help you. ...Read more
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 ...Read more
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. ...Read more
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. ...Read more
No: And they will be lighter and easier on the nose. ...Read more
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. ...Read more
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. ...Read more
Not related: Polycarbonate refers to the material that a lens is made from. Sphericity relates to the way the lens is ground. ...Read more
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. ...Read more
High index plastic (high prescription)
higher refractive index, then thinner
polycarbonate (impact resistant if monocular)
glass is rare now. ...Read more
If an optometrists checks off polycarbonate under "doctor recommends" stuff, what is polycarbonate?
Eyeglass lens: This is a higher index plastic lens used to give power without too much thickness. Your optom feels that with the power you have, that you need that extra thin-ness in your eyeglasses for comfort. ...Read more
See below: Differences between glass & plastic lenses: weight (glass much heavier); durability (plastic scratches more easily); price (glass generally more, depending on prescription, coatings, etc.). ...Read more
Eye glasses: Glass lenses are heavier and more durable. Plastic lenses are lighter and scratch more easily. Both have good optical characteristics. ...Read more
I really need new glasses but cannot afford them. How do I get some? Can I put new lenses in old plastic ones?
Replace lenses: Most optical shops can replace the current lenses with new ones, using the old lenses as templates to grind the edges to fit in the old frames. This can cut the cost if the old frames are in decent shape. You can also search thrift shops for a frame you might like and do the same thing. You will, however, need to pay for an examination to determine the power of the new lenses. ...Read more
Lighter, etc.: Plastic lenses are a comfort especially in high power needs for eyeglasses as they are lighter in weight for a given power. They are, however, less durable and can scratch in normal use. These factors can be eweighted in the udee ...Read more
Plastic: Plastic is lighter and provides equivalent visual quality. ...Read more
Post op CS healing: Most routine cataract surgery cases "heal" in 5-30d, depending on pt's age, cataract density, eye risk factors (ie, narrow angle, short eye, previous eye surgery, DM, uveitis hx, etc). If pt is healthy, young, soft cat, experienced surgeon, no complications, standardy IOL hard plastic lens, recovery usually 5-7days. Drops are continued for wks most cases. More info: http://eyedoc2020.blogspot. Com ...Read more
Practicemakesperfect: I think most will agree that the thought of putting something on your eyeball is a little strange and hard to wrap your head around initially. With proper instruction and practice though you'll get the hang of it in no time. Be sure your optometrist shows you the right way to put them in and take them out. ...Read more
You can't: You replace the lenses.Get a more detailed answer ›