US896814A - Veriscope. - Google Patents

Description

No. 896,814. PATENTBD AUG. 25, 1908. W. H. ELY.

VERISGOPE.

APPLIGATIQN FILED MAY 14; 1908.

able length and any WILLIAM H. ELY,.OF MIDDLETtlWN,TGONNEQ'DIGU'ITQ vnmscorn.

Specification of Letters Patent.

Patented. Aug. 25,1908.

Application'fl led. May 14, 1908. Serial No. 432,832.

To all whom it may concern:

citizen of the United States, residing at Middletown, in the county of Middlesex and State of Connecticut, have invented a new and useful Veriscope, is a specification.

This invention relates to a piece of apparatus which is-designed to be used in testing eyesight and in vei'fying lenses selected to rectifycorneal refraction in cases'of myopia, presbyopia and astigmatism.

The object of the invention is to produce a simple,.ineXpensive apparatus that can be readilyemployed by Opticians to instantly prove whether lenses selectedare too. strong, too weak, or are spherically or cylindrically proper to correct the defects of vision f a patient or client The embodiment of the invention illustrated has a spindle witha rest at one end that is adapted to be placed against the chin} of the person to be examined, a target at'the lines or characters on the near or accommoother end of the spindle, and an accommodation target located on the spindle, intermediate of-the chin rest and the far target, which targets are figures, letters or characters suitable for testing vision. The s rotarily h ld by a andle for convenience in the accompanying drawings .with the latter approximately in the positions occupied when the end of the spindle is resting against the chin of the patient. Fig. 3 shows a cross section on the plane indicated by the dotted line on Fig. 1 looking in the direction indicated by the arrow.

The spindle 1 is preferably formed of one or more pieces of round rod or wire of suitdesiredmaterial. This spindle is rotarily supported near the middle of its length 'by a sleeve 2 to whichis secured ahlandle 3 of any suitable design and materia At one end the spindle is provided with a button 4 which ,is designed to be placed against the chin of the person whose eyesight is to be examined. Secured to the end of the s indle opposite the chin rest is a disk 5. his disk, which referably is formed of thin metal, is desirab y held in place by a clamp screw 6, and on the face toward the chin rest of which the following 1 This device provided with any lines,

indle with these parts is-' of an apparatus thatis preferably secured a card 7 of white paper or other white material, containing suitable radial lines, figures, letters or other charactersdelineated in a contrasting color, usually black. Located onthe spindle between the supporting sleeve and the far target is a disk 8 preferably formed of metal, which disk on the face toward the chin rest is provided with a card 9 of white paper or other white material containing the same radial lines, figures, letters or other characters as are onthe card held by the far disk. The same lines, figures, letters or characters are printed or marked the same size, color and density on both targets. The spindle may be ornamented by knobs '10 and may have a section '11 of angu'lar cross section between the knobs, if desired. a

is-used by'having the. patient hold it by the handle with the button against the chin in such manner'that he-can see the lines, figures,"letters or characters upon the upper part of'both of the targets. If the dationtarget are blacker than the lines on the distant target, myopia is indicated. If the'lin'es or characters on the distant target appear blacker, presbyopia is indicated.

the lines or characters on bothtargets appear equally black, the focus is between the targets and is normal. If the focusis not normal the necessary lenses are placed in the trial frame worn by the patient until the focus is corrected, that is, is brought between the two targets. Fogging lenses are applied until the lines or characters on the far target are blurred and then these lines are brought out by suitable lenses, and if there is astigmatism one of the lines will be brought up to blackness quicker than the others, and this line indicates the meridian of the cylinder necessary to use .to correct the astigmatism.

are being made to prove these steps, and they may be turned around to bring the horizontal and vertical lines of the characters on the underside to the top for proving the test Any desired lines, letters, be placed on these with these lines. figures or characters may targets for the purpose sired tests. And-the targets may be formed by putting the lines or characters in a dark color desirably black upon a light background, desirably white, formed in any suitable manner upon or applied to the surfaces of the disks which are toward the chin rest,

'The targets may be rotated while these tests of making the dealthou h the sim lest and preferred way is to print t ese in b ack ink upon 'white cards Which'are slipped into recesses in the faces of l the disks.

' It is not absolutely essential that the lines,

figures, letters or characters on the two targets be identical in form or outline. They "should, howeveiy'be substantially similar in character and of the same density or blackness. In this arrangement the two targets are employedas checks against getting .the. 'focus too near or too far while trying cylinder lenses. It is necessary in making the proper tests with this instrument in cases of astigmatism, to bring'the farther focus within' or-nearer to the eye than the remote. target. Then the. nearer'or astigmatic-focus is carried out by the applicatlon of proper lenses until the foci are at an equal distance position of the foci, due to spasmodic or nerv: 3 0

from-the eye, somewhere-just within the far target and beyond the inner target, which is as. stated used to make sure that the farther focus is. brought inside of the far target.

This is indicated by the fact that the charac-, .ters. on the near target will be somewhat brighter than those on the far. target. The employment of the inner target in this manner elinnnates anypossible doubt as to the ous variations in the sight of the patient. By constant reference to the inner target and the comparison between the inner and outer,-

. the necessary conditions for a perfect test are readily indicated at all times.

With this simple instrument, the scpipe and corneal curvatureof an eye can'be rea 11y de y termined, and the power and requisite lens can be instantly determined and quickly- 1 Witnesses:

The invention claimed is.

1. A sight testing apparatus having a spindle provided with a plural number of targets located at a distance from eachother on the spindle, and similar lines, letters or characters of the same color and density arran ed on the facesoi' the targets, substantial y as specified.

2. A sight testing apparatus having a spindle with'a chin rest at one end, a target at .the other end, and a" target intermediate of the distant target and the chinrest, said tarets having on the faces toward the chin rest ines, letters 'or charactersof the same color,

arran ement and density, substantially as. speci ed. p

,3. A sight, testing apparatus having a spindle, a handle'rotarily connected with the spindle between 'the sleeve and thedistant target, said targets having on 'thefaces towardthe chin rest, disks of lightcolor with similar dark lines, letters or characters of the same color'and equal density, substantially as specified. i i

WILLIAM. I-IL'IELY.

' Josnrnmn M. STREMPF'ER,

HARRY H. WILLIAMS- other end of-the spindle, and a target on the y

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