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EP0135736A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Visual accommodation trainer-tester

Assignee: National Aeronautics and Space Administration
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Filing: 1984-08-03
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Granted: —
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Expires: 2004-08-03
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Abstract

Abstract The invention is an apparatus for training of the human visual accommodation system. Specifically, the apparatus is useful for training a person to volitionally control his focus to his far point (normally infinity) from a position of myopia due fo functional causes. The functional causes could be due, for example, to a behavioral accommodative spasm or the effects of an empty field. The device may also be used to measure accomodation, the accommodation resting position and the near and far points of vision. The device comprises a number of optical elements arranged on a single optical axis (74). Several of the elements are arranged in order on a movable stage (20) in fixed relationship to each other: a light source (30), a lens (32), a target (36), an aperture (42), (48) or (52) and another lens (58). On base (18) and in fixed relationship to each other are eyepiece (70) and a further lens (64). Stage (20) generates an image (72) of target (36) and the stage is movable with respect to base (18) by means of knob (22). The device is utilized for the various training and test functions by following a series of procedural steps, and interchanging the apertures as necessary for the selected procedure.

Inventors

  • 👤 Robert J. Randle

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-04 14:41
CPC Classifications
A; A61; A61H; A61H5/00

Claims Analysis

Total Claims: 10
Claim 1
Independent Claim 199 words
An apparatus for training and measuring the human visual accommodation system characterized by a base (18); an eyepiece (70) and a stage (20) mounted on opposite ends of said base (18); a first lens (64) mounted on said base between said eyepiece (70) and said stage (20); means (22,24) for moving said stage (20) toward or away from said first lens (64); a plurality of elements mounted on said stage (20) in linear optical alignment comprising a light source (30) mounted on the end of said stage (20) farthest from said first lens (64); a target (36) mounted on said base near the middle portion of said stage; a second lens (32) mounted on said stage between said light source (30) and said target (36); a third lens (58) mounted on the end of said stage (20) nearest said first lens (64) whereby an image of said target (36) is produced between said first lens (64) and said third lens (58) and said image is moved with respect to said eyepiece (70) when said stage (20) is moved; and a plurality of interchangeable apertures (42,48,52) mounted on said stage (20) between said third lens (58) and said target (36).
Claim 2
Independent Claim 199 words
An apparatus for training and measuring the human visual accommodation system characterized by a base (18); an eyepiece (70) and a stage (20) mounted on opposite ends of said base (18); a first lens (64) mounted on said base between said eyepiece (70) and said stage (20); means (22,24) for moving said stage (20) toward or away from said first lens (64); a plurality of elements mounted on said stage (20) in linear optical alignment comprising a light source (30) mounted on the end of said stage (20) farthest from said first lens (64); a target (36) mounted on said base near the middle portion of said stage; a second lens (32) mounted on said stage between said light source (30) and said target (36); a third lens (58) mounted on the end of said stage (20) nearest said first lens (64) whereby an image of said target (36) is produced between said first lens (64) and said third lens (58) and said image is moved with respect to said eyepiece (70) when said stage (20) is moved; and a plurality of interchangeable apertures (42,48,52) mounted on said stage (20) between said third lens (58) and said target (36).
Claim 3
Dependent Claim 38 words
An apparatus as set forth in claim 1 wherein said light source (30) and said second lens (32) are enclosed within a chamber (28) and said target (36) comprises a portion of one wall (38) of said chamber.
Claim 4
Dependent Claim 29 words
Apparatus as set forth in claim 1 further characterized by having a diopter readout (23) to show the relationship between the movable stage (20) and the first lens (64).
Claim 5
Dependent Claim 46 words
The apparatus of claim 1 wherein said light source (30), first (64), second (32) and third (58) lenses and said eyepiece (70) are aligned on a single optical axis (74) and wherein only one aperture (42) is effectively on said optical axis at any given time.
Claim 6
Dependent Claim 55 words
The apparatus of claim 4 wherein said aperture (42) is at the focal plane of said third lens (58), said target (36) is two focal lengths from said third lens (58) and said target image is two focal lengths from said third lens (58) and between said first lens (64) and said third lens (58).
Claim 7
Dependent Claim 25 words
The apparatus of claim 1 wherein said interchangeable apertures (42,48 and 52) comprise a wide-open aperture (42),a pinhole aperture (48) and a two-hole aperture (52).
Claim 8
Dependent Claim 25 words
The apparatus of claim 6 wherein each hole of the two-hole aperture is covered by a different colored filter (75,76) to provide a defocus cue.
Claim 9
Dependent Claim 27 words
Apparatus as set forth in claim 6 wherein means (44,46) are provided for moving at least one of said apertures on and off of the optical axis.
Claim 10
Dependent Claim 28 words
Apparatus as described in claim 6 wherein means (78) are provided for alternately positioning the pinhole aperture (48) and the two-hole aperture (52) at the optical axis (74).

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