Doctor insights on:
Glass Lenses Vs Polycarbonate
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 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
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
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: And they will be lighter and easier on the nose. ...Read more
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
No: I wouldn't worry too much about that. Do clean if off thoroughly before using. ...Read more
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
I have a crack a polycarbonate eyeglass lens starting at the edge. What would happen if hit by ball?
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
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
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
Very different: Eyeglass lenses can either magnify, minify (make images smaller) or correct astigmatism. Magnifying glasses are used in readers and prescription lenses for farsighted and presbyopic people, while minifying lenses are used for those with nearsightedness. Also, there can be magnification or minification with astigmatism correction at the same time. Glasses are built specifically for your vision. ...Read more
Optical : Some scratches in plastic lenses can be buffed lightly to cover them up. Glass lenses fortunately don't have scratches as commonly but are not as treatable when they do. Go to your optical department and show them your spectacles and ask if they are able to help you. ...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
Plastic: Plastic is lighter and provides equivalent visual 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
Been myopic frm 8.Now 45 n hav been on contact lens for 32 years wid-5.25 right n -4.25 cylindrcl -0.75.Cn I do laser. F 1month on reading glass 1.75?
If glasses are so near the eyes so much so that eyelashes touch the glass lens often...does it affect the eyesight /vision in anyway??
No: No, the position of your glasses doesn't adversely affect your eyes, but will alter the proper focus of the light entering through the lenses. Of course it also depends on how strong the prescription is, with extremely high degrees myopia or hyperopia the vertex difference does make a difference. Also the eyelashes do flick moisture onto the lenses altering clarity. You should make sure lenses fit. ...Read more
Why can't they make a progressive eye glass lens where the vision for intermediate and reading is wider... Even to the edge of the frame?
Not optically done: Progressive lenses have two issues: 1) giving a continuous grind to allow for several distances of clear vision and 2) cosmetic optics so that the continuous grind is not evident. They could make a lens with a much larger optic as you are hoping for but this would produce obvious optical distortions that would make the lens look odd and would not reach the edge of the lens anyway. ...Read more
What do you advise if I'm using eye glass from two year. but now I want to try eye contact lens.but I don't know is contact lens is good?
Ask eye doc: Your eye doctor can advise you on this. You will need to see him/her to be fit in contact lenses. There are many types of contact lenses available. ...Read more
Is there any natural way to improve weak eyesight(myopia)beside glass correction or surgery??? Plus lens therapy??
I don't know of any: Sadly, unless you have an eye disease such as glaucoma, correction of your vision can only be done with one of these. If the eye problem is of new onset, you should definitely have your eye pressure checked, to prevent glaucoma or another disease from taking your vision altogether. ...Read more