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Hi,
Can someone out there give me some advice on lens types. I'm a massive -35D and my optician has always fitted me with myodiscs. I hate them. I see people (well shapes) walking behind me through the carrier portion of the lens.
She has insisted that they are all that is available, but I wondered if a full field lens was available in this power.
Paul
Contacts. Get the myodiscs and use them only to find your contacts with in the morning and to find the bed and bathroom at night.
Chip
I would suggest checking into a myodisc freeform lens. My understanding is that it would widen your viewing area giving you better peripheral vision and over all better quality optics. Also, you should always have a good anti-reflective coating on your lenses with that high of a power.
Hey Paul,
Please review our posting guidelines:
This forum is for Eyecare Professionals. Consumers are allowed to post in the Just Conversation forum and non-optical topics only. Please be aware that any questions involving optics or eyecare may be removed. These kinds of questions should be discussed with a qualified eyecare professional who has examined you and is familiar with your situation.
PS. Smooth move posting this in the:
Optiboard Amazon Store Forum!
:hammer::cheers::cheers::angry::cheers::cheers::mad:
I thought it was a cute idea, especially since he is supposedly an optical professional. :DQuote:
Originally Posted by Fezz
:cheers:
I giggled at that also!Quote:
Originally Posted by Jacqui
I figured that it was a tad "short-sighted" to post in this forum!
You could get your optician to frost one side of the carrier, you can't see out of this portion of the lens anyway.
Chip
wait...how did anyone manage to post a thread here in the first place?
Weird, huh?
OK, IF you're not a consumer, and IF you have a fair amount of money, you can have your ophthalmologist do a clear capsule exchange and reduce your minus to ludicrously low levels and you can get nice thin, normal lenses.
Otherwise,stare intently into a UV light for eight hours daily, and with luck, in a few years you might have cataracts dense enough to be removed under insurance. Same result. I was a minus 15 until my cataract surgery.
35D is equal to a focal length of 28mm roughly, if the catoptric power of any of the curves matches closely with that focal length you will get sharp and in focus ghost images. A change in curve to change the clarity of the ghost image could help. You can reduce reflections or ghost images with an AR or like mentioned frost the carrier. A light tint could help as well to dull down the reflections.
Hi there,
This is what you want to do if you cannot wear contact lenses. I teach the Opticianry program here in Los Angeles so this is what I tell my students in situations like this. Younger Optics makes a blended Myodisc. This lens requires less work for the optical laboratory. It has advantages of the minus lenticular design and it erases the line between the bowl and the carrier so that it is not seen. The Myodisc Aperture portion is where the prescription is located, then there is the outter area known as the carrier in all myodisc lenses. This lens can be made with either a plus or minus carrier. Talk with your optician about this blended myodisc lens. If you have any more questions please let me know. I hope this helps.
Quote:
Originally Posted by deejc9
You might want to update that info. Younger discontinued their blended myodisk two or three years ago.
A blended myodisc can be done for cosmetic purposes but it may not solve the problem you have regarding what you're seeing out of the lens periphery. You could frost the lens carrier but I suspect this will not have the desired cosmetic results you are looking for. My suggestion would be to find the absolute smallest frame you can tolerate and then demand that your optician find a lab that can run the job as a full field. With a -35 RX there will probably be some factors at play that may make this more difficult such as your PD/decentration in the frame, lens blank thicknesses and how you can tolerate the corresponding edge thickness of your glasses. But this would eliminate any "no-view" zone in your glasses and theoretically allow you to use the entire field of the lens.
And yes, blended myodiscs have been discontinued by Younger but you can make a blended myodisc in the lab out of higher index lenses than plastic.
There is also the Free-Form surfacing process which is being used at some labs as well. Blended myodiscs can be used with this process. Talk to your Optician about the free-form surfacing process and if it can be done with your prescription. 20/20 Magazine posted an article last month in regards to free-form surfacing special lenses. Even though younger does not make the blended anymore (was using younger as an example), you can still get a blended myodisc made for cosmetic purposes.
1. This is in the Amazon Store forum.
2. This is a consumer post.
3. This forum is for Eyecare Professionals. Consumers are allowed to post in the Just Conversation forum and non-optical topics only. Please be aware that any questions involving optics or eyecare may be removed. These kinds of questions should be discussed with a qualified eyecare professional who has examined you and is familiar with your situation.
I just finished a pair of -37.00 spheres and using the tools of index should have made it easy with 1.74 blanks. But I also realise that abbey values with high index can be a problem. I used the belgium system where three sets of tools are used to creat the blended. Younger myo's were nice both plus and minus carriers but you had to settle for the size where your frame might cut it off.I have 47 years in surfacing of everything,plus all the new equiptment for slabs-free form-and pretty much everything you used to do by hand,now on the machine. I love it but I still have to do the out of range rx's by hand-Yes a hand pan.
A much bigger optical zone with a smaller blended myodisc can be surfaced with a 1.9 index glass lens,with A.R. coating.You can find a Lab in Europe to make such a lens.A small frame is recomended.
I have a customer with an rx of -18.50-4.50x180, -18.50-5.00x180 with a pd of 34/32.5 and a frame size a=48, dbl=17, b=26. I read up on younger blend myodiscs which may seem like a good choice. Could someone tell me whats the best bowl size for this frame to minimize edge thickness as much as possible?
The premade myo-disc are very thick even when finished-I suggest put the cyl on the front side using whatever base will make the front a sphere grind-index if you can use will be very helpfull if not your still able to make a nice job.plano-500 then sphere front side make whatever size field you want using either a plus curve to eliminate to thick outside or a flat curve to do the same.I have so many tricks to use making these. you just have to use your brain to picture the job finished.The old rule of thumb was 4mm shorter than the vertical-but I can make what ever you want.I can do it all and your welcome to call-607-734-4251 ask for bill.7/05/11 I'll be taking to rochester to visit a doctor but will be back at it wensday 7/6Quote:
Originally Posted by lenzdoc
not a problem-I can do these and make them to make you happy.Is there anyone out there interested in learning this trade because I can't find anyone to teach-48years I'll have to quit sometime but not soon.I have all the old equiptment including a row of just sphere machines-oldfield cutters- make any tool-hand pan to tip on curves to start a surface my generator won't cut. Don't just say get contacts until you have explored the world of downtownbillybrown's special lab.
DowntownBilly:
Why not take a digital camera, record what you do and put it on U-Tube or on Optiboards if you can figure out a way to put it on Optiboard. A capability that either eludes me or Optiboards for some reason isn't capable of.
Chip
We are now 80% essilor and they frown on camers in their lab.You have to sign your life away just to visit the lab.Not like the old days eh?
I would use a Bi-Concave -8.00 Base Curve and a -25.50 back curve with Hi-Index Glass (Flint)@1.70 index. Then I would grind A 0.5 CT.
Is the carrier polished ? If so get a 1000 micron 3M fining pad and remove the polished edges. I would also use a P-3 zyl (ASAP) as small as possible. I am sure you have used every Contact under the sun but have you tried Synerges softperm.
I have 39 years working in the eyecare field & have never seen a -35.00 Good Luck
DJ