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A refractometer with a comparative vision correction simulator

A vision test and instrument technology, applied in the field of contrast simulation of vision, can solve the problems of not providing a method to demonstrate the quality of vision, inaccurate instrument adjustment and measurement, etc.

Inactive Publication Date: 2014-12-10
DIGITALVISION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Another disadvantage disclosed in patent 3,240,548 is that, like the other prior art mentioned above, it must be placed in close proximity to the patient's eye, potentially causing inaccuracies in instrument adjustment and measurement
Corrective lenses with these and other optical properties are increasingly being used, however the vision testing methods listed in the prior art do not provide a way to demonstrate the benefits of these properties or the quality of vision they provide

Method used

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  • A refractometer with a comparative vision correction simulator
  • A refractometer with a comparative vision correction simulator
  • A refractometer with a comparative vision correction simulator

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Embodiment Construction

[0037] In general, the instrument is intended to be deployed in a typical, but non-limiting, 8' x 10' dimension within the eye care professional's examination area. like figure 1 and 2 As shown, the instrument includes a tower 1, an examination chair 2A, a viewing port 3 housing a reflective field mirror 4 and one or more optional cameras 4A, and an operator control terminal 5. A patient 1A for a vision test with the instrument is seated on an examination chair seat 8 , which is adjusted so that the patient's eyes are placed in the desired examination positions marked by boxes 9 . The images are generated by a wavefront generator 10A or other device in an optical tray 10 and are directed towards a field lens 4 in a viewing port 3 where they are reflected onto the patient within the desired examination position 9 Eye. Behind the patient, the rear case 1 houses the computer, power supply, and other specialized electronics to control the wavefront generator located in the opti...

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Abstract

A method and apparatus for vision testing and for simulation of eyesight correcting modalities is disclosed, the method including generating one or more images to be viewed by a patient, modulating the wavefront of each image by a differing amount and / or changing other optical attributes of one or more images by differing amounts, and selecting the preferred image based upon patient response. The apparatus includes devices for generating one or more images to be viewed by a patient, modulating the wavefront of each image by a differing amount and / or changing other optical attributes of one or more images by differing amounts, and devices for selecting the preferred image based upon patient response.

Description

technical field [0001] The invention relates to a subjective, monocular or binocular, patient-interactive visual acuity test and a comparative simulation of visual acuity provided by different specifications of visual acuity correction methods. Background technique [0002] A phoropter lens dial, such as that described in US Patent No. 4,523,822, is currently the most commonly used vision testing device. The phoropter consists of a dial consisting of fixed spherical and cylindrical power lenses that vary in 0.25D or 0.125D increments. During the vision test, the phoropter is placed in front of the patient's eyes, and different lenses are dialed into the viewing port of the device, while the patient looks at the letters on the eye chart through the selected lens. Based on the increase or decrease in letter clarity the patient perceives with each lens combination, the optometrist iteratively determines the best combination of spherical and cylindrical lenses to correct vision...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B3/02
CPCA61B3/0025A61B3/103A61B3/02A61B3/0083A61B3/028A61B3/032A61B3/1015
Inventor 基思·P·汤普森乔斯·R·加西亚
Owner DIGITALVISION