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Medical Forum / General / Vision / November 2007Optical device ID
I'm trying to identify an optical device, if you have a minute please take a look at the photos here: http://img.photobucket.com/albums/v80/harnett65/album%207/_optic2.jpg http://img.photobucket.com/albums/v80/harnett65/album%207/_optic3.jpg http://img.photobucket.com/albums/v80/harnett65/album%207/_optic4.jpg Please let me know if you recognize it. Thanks, Rob > I'm trying to identify an optical device, if you have a minute please take > a > look at the photos here: That's pretty fascinating. I've seen a lot of antiques but nothing like this. What happens when you move the lever around that scale marked -8 to +10? It just rotates the lens bar? The brass tools in the front left corner of the case have a concave face. Is that pink putty, like hardened mud? Do those tools fit onto the dialing device? The frosted glass trial lens would be a projection surface, if it's original. The extra arm looks like it might have held a light source, maybe sodium lamp. From the design and finishes, it could be as old as 1900 or as new as 1940. There's no company name embossed on the case? Neither of the purple velvet inserts pop out, do they? -MT,OD > http://img.photobucket.com/albums/v80/harnett65/album%207/_optic2.jpg > [quoted text clipped - 6 lines] > Thanks, > Rob >> I'm trying to identify an optical device, if you have a minute please >> take a [quoted text clipped - 24 lines] > > -MT,OD >> http://img.photobucket.com/albums/v80/harnett65/album%207/_optic2.jpg >> [quoted text clipped - 6 lines] >> Thanks, >> Rob Thanks for your help, I sent your questions to the owner of this device and here is his reply: "If you look through the lens and rotate the arm nothing appears to change. The brass disks have pink paint in the concave and what appear to be the eyes blood vessels leading to a raised pimple which would be the optic nerve (what it looks to me anyway) and is blank on the other side painted black, the piece fits snugly into the back? of the dialing device . The frosted glass lens appears to be original and the extra arm is slotted which may hold a card ?? . There are also 2 black slides with 3 openings, both slides have 2 empty openings and one opening with glass which doesn't appear to be ground at all. The velvet bottom in the the case lifted out but revealed nothing ( treasure map would have been nice) and there is no markings at all on the case or bottom of the brass stand and I wasn't game to force the lining from inside the lid." He also sent some new photos: http://img.photobucket.com/albums/v80/harnett65/album%207/_optic6.jpg http://img.photobucket.com/albums/v80/harnett65/album%207/_optic8.jpg http://img.photobucket.com/albums/v80/harnett65/album%207/_optic9.jpg Rob > "If you look through the lens and rotate the arm nothing appears to > change. The brass disks have pink paint in the concave and what appear to [quoted text clipped - 8 lines] > and there is no markings at all on the case or bottom of the brass stand > and I wasn't game to force the lining from inside the lid." I'm sure the painted retinal images are crucial but I don't see how it could work as a device for practicing ophthalmoscopy or calibrating some sort of ophthalmoscope. It appears the concave retinal images are inserted into the dialing device face-IN, which makes no sense because there's no light path through the dialing device. I'm curious enough that I'd like to post the photos to an optometry list, if you're willing. -MT >> "If you look through the lens and rotate the arm nothing appears to >> change. The brass disks have pink paint in the concave and what appear to [quoted text clipped - 17 lines] > I'm curious enough that I'd like to post the photos to an optometry list, > if you're willing. Yes, feel free to post them there if you want. Rob > Yes, feel free to post them there if you want. Not much luck, I'm afraid. I've heard two suggestions back from the list. One suggestion was it's a "Badal optometer" but that isn't possible because those work like a viewmaster or stereopticon - clear path from lens to target, and not much else. Another suggestion was - it's a towel rack. Best I can figure it's a device for practicing ophthalmoscopy. -MT, OD >> Yes, feel free to post them there if you want. > [quoted text clipped - 11 lines] > > -MT, OD Thanks for checking, if I ever find any info on it, I'll post it here. Rob Mike Tyner schreef: > Best I can figure it's a device for practicing ophthalmoscopy. > > -MT, OD I also was thinking about a practicing device and besides meant for ophthalmoscopy I was thinking it is used to practice in skiascopy (in the USA called retinascopy?) Both spherical and cylindrical. Because there is no TABO scheme for the axis on the device I might suggest this instrument must be old, I think +/- 1900. Besides a towel you might think of an oil or carbid lamp placed on the hook. I think you can place the hook just out of the axis or beside the artificial eye so the practicioner can use the mirror on his head to observe. I have some antique instruments without an internal light with which you can practice skiascopy (retinoscopy) and ophthalmoscopy as well by just changing a mirror. Greetings, Jan (normally Dutch spoken) > Mike Tyner schreef: > [quoted text clipped - 23 lines] > > Jan (normally Dutch spoken) Thanks, this is the answer that I posted on the answer page of my web site: http://pzphotosans204-wt.blogspot.com/ Rob > Thanks, this is the answer that I posted on the answer page of my web site: > > http://pzphotosans204-wt.blogspot.com/ I feel compelled to add that 1131 and 1132 were probably NOT used WITH 1130. Probably not. ;-) |
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