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Yes, those markings are supposed to be there. The numbers are your add power, 2.00 in your case. The letters are to identify the brand. The circles are to allow an optician to recreate the fitting crosses, which is sometimes necessary if someone is having trouble with the lenses. Progressives are tricky to fit properly.
FWIW 17 is fairly wide. SCSimmons August 3, 2011, 2:35pm 6. Themenin: The 17 refers to the “nose gap”. So your overall frame width is 117 mm : 2 times 50mm + 17mm. And the primary use the optician puts the numbers to is to place the optical center (OC) of the lenses correctly when they cut the lenses to the frames.
The 17 refers to the "nose gap". So your overall frame width is 117 mm : 2 times 50mm + 17mm. And the primary use the optician puts the numbers to is to place the optical center (OC) of the lenses correctly when they cut the lenses to the frames.
Factual Questions. pullin December 8, 2023, 3:13pm 1. I have an Optometrist’s prescription (written) and have used it to order glasses from EyeBuyDirect. These worked perfectly for distance, but now I need readers for close up vision, and the notation is confusing. The actual values are: OD: Sphere: +150.
The Advantages of Progressive Lenses Over Bifocals and Trifocals. Progressive lenses give a young look to bifocals. Progressive lenses are like bifocals, only the transition between one focal region and the other isn’t abrupt, as in a classical bifocal, but changes gradually – progressively, hence, the name.
Location: England. Posts: 58,255. 'Lens marks' on brand new spectacles - WTF? I just stopped postponing the inevitable and spent a painful amount of money on some new spectacles. I have quite a high prescription (about +6 dioptres), so I have to go for the extra-spendy high index optical plastic, or the lenses come out like coke bottles.
The “model” is the model number. The “power” is the refractive power of the lens in diopters. The “length” is the length of the lens in the superior-to-inferior axis (i.e. up-down.) “Optic” is probably the optic zone, or the usable zone of the lens; not all of the diameter of the lens is used for vision, which is fine as your pupils are probably going to not let light in ...
If they’re 123, they’re there so you know which way to put them in. If the 123 aren’t backwards while you’re holding it on your fingertip, you know it isn’t inside-out. Athena February 6, 2009, 8:18pm 3. Yup. I wear AccuVue brand contacts, and they each have AV on them so you can tell if they’re inside out.
20/20 does not mean perfect vision. -4.25 and -4.75 measure the power of your lenses, a negative correcting nearsightedness. Two people who can focus correctly at 20 feet, with or without lenses, may have slightly different visual acutity. One may be able to read smaller print even though both people are in good focus.
In the past I’ve gone to an optometrist to get eyeglass prescription updates, who use negative notaton prescriptions. Recently I went to an opthamologist who uses positive notation. I want to make sure I understand the difference before I submit the prescription for buying glasses online. My previous (negative) prescription was this: OD (right) SPH -2.50, CYL -1.75, AXIS 5 OS (left) SPH -2. ...