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- Flex Vision Adjustable ...Trusted Deal Source$34.99
- Adjustable Focus Glasses ...chyhua.com$19.69
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- Flex Focus Glasses - ...neweledy$27.50$99.98
- Flex Focus Glasses - ...Caibii$58.90$499.99
- Prism Glasses 150mm...Temu$38.22$115.50
- Adjustable Glasses Unisex...Oladoct.com$14.99
- Clearview Pro Glasses - ...Softlle$72.90
- MRI Prism Fitover GlassesZ&Z Medical$59.00
- New Bed Prism Spectacles...Temu$4.60$4.62
- Flex Focus Glasses - ...Koorisa$129.99
- Bolle 40059 Prism Safety ...Full Source$9.19
- Adjustable Focus Glasses ...Katml$19.50$39.65
- North Coast Medical...Grayline Medical$69.99
- New Bed Prism Spectacles...Temu$10.59$10.60
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Adjustable focus eyeglasses are eyeglasses with an adjustable focal length. They compensate for refractive errors (such as presbyopia) by providing variable focusing, allowing users to adjust them for desired distance or prescription, or both.
These models are often called adjustable objective (AO or A/O for short) models. Occasionally, a side-focus design (see below) might be used with a fixed reticle within the eyepiece , onto which the second focal plane (SFF) of the target image is shifted by an adjustable erector lens group .
Binoculars using either a Schmidt–Pechan roof prism, Abbe–Koenig roof prism or an Uppendahl roof prism benefit from phase coatings that compensate for a loss of resolution and contrast caused by the interference effects that occur in untreated roof prisms.
Incomitant strabismus cannot be fully corrected by prism glasses, because the eyes would require different degrees of prismatic correction dependent on the direction of the gaze.
Diplopia with normal binocular function is treated with prism glasses, botulinum injections into the muscles, or repeated surgery. If binocular function is not normal, a more individualized approach is necessary to best suit the patient's needs.
Prism correction. Prism lenses (here unusually thick) are used for pre-operative prism adaptation. Eye care professionals use prism correction as a component of some eyeglass prescriptions. A lens which includes some amount of prism correction will displace the viewed image horizontally, vertically, or a combination of both directions.
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