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Medical Forum / General / Vision / February 2006new glasses
whats up everybody, i'm new here, and i've been wearing contacts for 6 years, and just got my 1st pair of glasses, finaly. my prescription for glasses is OD -4.75 C SPH OS -4.75 C -0.50 axis 178 i went to pearl vision and they recomended their polythin lenses(polycarb), with anti glare. i received them today, and they look kind of thick, it is very noticable the overlap on the lenses. I noticed other people glasses today, and they dont seem as thick as mine, and i have the polycard lens. Is this right??? is -4.75 that strong that even with the poly lenses they look kind of thick????? the lady told me it was because i have a strong prescription. they also feel wierd and of course, blury on the sides, way different from my contacts. Does this seem right??? and what else can i do to make them thinner??? are they supposed to look kinda of thick at my prescription???? here is the link to myframes.. http://www.theyedoctor.com/products/_cid_10001-pid_28733__product.aspx thanks. smaller frame, higher index will make them thinner. If you dont like glasses, you can go back to contacts and wear glasses around the house > whats up everybody, i'm new here, and i've been wearing contacts for 6 > years, and just got my 1st pair of glasses, finaly. [quoted text clipped - 16 lines] > http://www.theyedoctor.com/products/_cid_10001-pid_28733__product.aspx > thanks. -475 is stronger than the average person's prescription, so you'd expect it to be thicker than most pairs of glasses you'd see on other people. Also the bigger your frame the thicker your lenses will be. Your frame is not very small... but I don't know how big your head is, maybe you can't afford to go any smaller!! If it's blurry on the sides (ie. when not looking through the centre of the lens) that's a quality of polycarbonate. To make them thinner you can take them back and ask if you can upgrade to a 1.67 or 1.7 material. Or better still get them cut down into a smaller frame. Dom > > whats up everybody, i'm new here, and i've been wearing contacts for 6 > > years, and just got my 1st pair of glasses, finaly. [quoted text clipped - 32 lines] > > Dom I do have a nice size head, so most glasses looked too small on me, and I wanted the rimless kind, but my rx is too strong. their not that thick, but i was suprized when i saw them, i knew they wouldnt be the thinnest, but i was surprised. I'm not gonna wear them all the time, but i dont wanna have the lens look that thick, becasue i will wear them sometimes in public. I asked if their was anything else thinner than micro thin (poly), she said it was the thinnest avaialable, no mention of high index. so....i dont know. do you think it is worth to upgrade to hi index, will i notice a big difference???? > do you think it is worth to upgrade to hi index, will i notice a big > difference???? hard to say if it's worthwhile, but possibly not as the difference may not be that great. cutting the lenses down into a smaller frame may make a bigger (& cheaper) difference. Dom > I do have a nice size head, so most glasses looked too small on me, and > I wanted the rimless kind, but my rx is too strong. their not that [quoted text clipped - 4 lines] > than micro thin (poly), she said it was the thinnest avaialable, no > mention of high index. so....i dont know. Here are some representative indexes of commonly used materials: 1.50 Regular Plastic (AKA CR-39 or hard resin) 1.54 Mid-index such as Sola Spectralite 1.59 Polycarb 1.60 Plastic 1.66 Plastic 1.70 Plastic The higher the index, the worse the optics as determined by abbe value, which is a measure of chromatic aberration (the higher the abbe value, the better the optics). Usually the higher the index, the lower the abbe value, except for polycarb which has the lowest abbe value of any commonly used material. In short, polycarb sucks from an optical point of view, but it is considered to be a "safety" lens because of its high impact resistance and high tensile strength.. The best place to get discount lenses is Costco or Wal-Mart/Sams. They carry much better quality brands than Pearl Vision. If you want good lenses, you will have to pay a bit more. Dom, what would you call average? >> whats up everybody, i'm new here, and i've been wearing contacts for 6 >> years, and just got my 1st pair of glasses, finaly. [quoted text clipped - 17 lines] > >Dom > Dom, what would you call average? In my practice the most popular contact lens powers we dispense are between -250 and -400. It seems to me that many teenage & young adult myopes seem to stabilise around -400 and only some progress beyond that. Strictly speaking I am referring to the mode rather than the average. As far as a statistical average (or modal) refraction for myopes is concerned - I don't know. But if you took 100 myopes off the street at random I'm sure the majority of them would be less than -475. Dom dont forget that -4 contacts are around a -5 in glasses depending on the person. Contacts appear to behaive differently for each eye. You could take two people with -5 glasses pescriptions, one may see fine with -4 contacts(such as me for example) while another may need -4.25 or even -4.5 contacts! You are right that most are less than -4.75, in fact most will be less than -3. I know lots of myopes and id say near 2/3 of them are less than -3, in fact a good potion of them have such low myopia they dont regulary wear glasses. This lady was only -1 and seeing 20/40 UCVA so she had absolutely no need for glasses unless she actually loves wearing glasses(which she doesnt) >dont forget that -4 contacts are around a -5 in glasses depending on >the person. Contacts appear to behaive differently for each eye. You [quoted text clipped - 8 lines] >she had absolutely no need for glasses unless she actually loves >wearing glasses(which she doesnt) I guess your sample is greater than the previous poster who tests patients every day. Ho hum! Ann |
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