US868373A

US868373A - Retinoscope.

Info

Publication number: US868373A
Application number: US33984706A
Authority: US
Inventors: Stewart C Thomson
Original assignee: Individual
Current assignee: Individual
Priority date: 1906-10-20
Filing date: 1906-10-20
Publication date: 1907-10-15
Anticipated expiration: 1924-10-15

Description

PATENTED OCT 15, 1907. S. G. THOMSON.

RETINOSGOPE. APPLICATION 11,111) 001*.20. 1000.

2 sums-sum 1.

THE N No. 868,373. PATENT ED OCT. 15, 1907.

S. G. THOMSON.

. .RETINOSGOPE. APPLIOAITION nun 001'. 20. 1906.

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3mm: 63 6, 7&072/50 27- Tn: NORRIS PETERS cm, vmsumcwrv. n. c

STEWART O. THOMSON, OF ARROWSMITH, ILLINOIS.

RETINOSCOPE. t

Specification of Letters Patent.

Patented Oct. 15, 1907.

Application filed October 20, 1906. Serial No. 339,847.

To (ll Z whom it may concern:

Be it known that I, STEWART C. THOMSON, a citizen of the United States, residing at Arrowsmith, in the county of McLean and State of Illinois, have invented certain new and useful Improvements in Retinoscopes, of which the following is a specification.

This invention provides an instrument for determining errors in refraction by skiascopy and which will obviate the necessity for a dark room and which may be used by the average practitioner, the instrument. being adapted to be readily reduced in size for convenience of storing and handling and admitting of its use in much the same manner as an ophthalmoscope and whether the patient is sitting or in a recumbent position. I

For a full description of the invention and also to acquire a knowledge of the details of construction reference is to be had to the following description and accompanying drawings.

While the invention may be adapted to different forms and conditions by changes in the structure and minor details without departing from the spirit or essential features thereof, still the preferred embodiment is shown in the accompanying drawings, in which:

Figure l is a perspective view of a retinoscope embodying the invention. Fig. 2 is a detail view of the cap or end piece receiving the series lens holder. Fig. 3 is a detail view of the end of the telescoping tube adapted to receive the ordinary hand retinoscope. Fig. 4 is a horizontal section of the larger end portions of the telescoping tube. Fig. 5 is a front view of a portion of the series lens holder. Fig. 6 is a longitudinal section of the series lens holder.

Corresponding and like parts are referred to in the following description and indicated in all the views of the drawings by the same reference characters The instrument comprises a telescoping tube 1 of such formation as to admit of its sections being readily moved either inward or outward, as may be desired. The larger end of the telescoping tube is provided with supports 2 adapted to receive and hold in place an ordinary hand retinoscope 3. A cap or end piece 4 is fitted to the small end of the telescoping tube by means of a slip joint and is provided at its outer end with guides 5, which receive lens holder 6 for a se rics of test lenses. the said holder being vertically adjustable in the guides 5 and adapted to receive a number of lenses selected from a case and arranged in the holder one above the other. The telescoping tube is adapted to be supported by means of a suitable stand which comprises a base 7 and an upright S, the latter being tubular and receiving a stem 9 to which is attached a band 10, the latter embracing the telescoping tube 1. The stem 9 is adjustable in the upright S and is held in an adjusted position by means of a set screw threaded into a side of the upright 8.

An inclined tube 11 is fitted to a side of the telescoping tube near its outer end and inclines so as to occupy a rearward and outward angling position When the telescoping tube ,1 is placed in an approximately horizontal position. A second tube 12 is connected to the outer end of the inclined tube 11 and is arranged to occupy a perpendicular position and is adapted to receive a suitable light or illuminator and a screen the latter being provided with a series of openings so as to regulate the amount of light thrownupon the retinoscope 3. The inclined tube 11 is so positioned as to direct the light from the illuminator upon the retinoscope 3 by means of which the beam of light is directed to the telescoping tube 1 into the eye of the patient to enable any error of refraction being ascertained.

The series lens holder 6 consists of a strip of metal having openings at intervals in its length and provided with flanged supports 13 at the lower side of the respective openings to receive and support the several lenses 14. The lens holder is vertically adjustable in the guides 5 of the end piece 4 and in order that the operator may be enabled to readily adjust the lens holder from the outer end of the telescoping tube 1, a rod 15 is provided and is connected at one end to the lower end of the lens holder 6.

A forked bar 16 is secured to the upright 8 of the stand and projects upwardly therefrom and the rod 15 is supported by one member of the bar and is adapted to take underneath any one of a series of notches or projections 16 on the other member, whereby to hold the part 6 at the desired adjustment.

The screen for regulating the light to the hand retinoscope is preferably in the form of a band 17 which encircles the vertical tube 12 and operates through slots formed in opposite sides of the inclined tube 11.

Having thus described the invention, what is claimed as new is:

1. In a retinoscope, a tube adapted to have light directed therethrough from an illuminator by means of a lens, a cap fitted to said tube and provided with guides, a lens holder" adjustable in the guides of said cap, a jointed rod connected with said lens holder, and a notched bar co operating with the rod for holding it and the lens holder in an adjusted position.

2. In an instrument of the character specified, the combination of a main tube adapted to receive a retinoscope at one end and lenses at the opposite end, and an adjustable holder for said lenses, :1 stand for supporting said tube and adjustable to admit of regulating the elevation of the instrument, a rod extended from the adjustable lens holder and a notched bar projected from the stand and cooperating with the rod to hold it and the lens holder in an adjusted position.

3. An instrument of the character described, comprising a tube adapted to receive a retinoscope at one end and provided with guides at the opposite end, a lens holder vertically adjustable within said guides and provided with a series of openings at intervals and lens supports contiguous to the respective openings, a stand upon which said tube is supported and adjustably mounted so as to be held at diiferent elevations, and a supporting device secured to the lens holder and adjustably mounted upon the stand 4. An instrument of the character specified, comprising a main tube adapted to receive a retinoscope at one end, a lens holder adapted to be applied to the opposite end of 10 the tube and arranged to support a series of test lenses, :1

stand on which said tube is mounted, a forked bar se 1 'cured to said stand, one member of said bar being pro vided with a series of notches, and a rod connected to the lens holder and to one member of the fork and adapted to take under any one of the notches of the other member, as and for the purpose set forth.

In testimony whereof I afiix my signature in presence of two Witnesses.

, STEWART C. THOMSON. [L. s.] Witnesses:

L. C. VIRGIEL,

J. H. JAcoBs.