DE1737506U - ADAPTOMETER. - Google Patents

Description

OptiSihe IMe GflodenStOlk Munich

Sheet to the letter from

Adaptometer

The invention relates to a device for testing adaptability of the human eye, i.e. for the plague, how extensively and how quickly the set to high brightness see Eye can adapt to a lower level of awareness in such a way that it also helps recognizes certain test marks * The suggestion concerns some improvements! which the lessings on a larger number of to be examined People designed as uniformly as possible.

Devices are known which essentially consist of an Ulbricht sphere, that is, an illuminated cavity with a white interior, into which the examinee looks so that his entire viewing angle is uniformly filled. After darkening, test marks are thrown on the white wall opposite the viewing opening with the help of a!

However, it has proven to be useful * not to project these signs in incident light, but rather to present them directly to the person to be examined as backlit slides. In which the to be tested so hineinblicktj that its angle of view his head in the usual manner · is filled from the inner surface of this hollow body * Suitably wi £ d by chinrest and forehead support Accordingly, the invention consists of an internally there is adaptometer according white lined hollow body of suitably hemispherical shape, fixed "'A few incandescent lamps placed outside the field of vision' provide for ^; even ^ relatively high illuminance in the interior.

Opposite the main viewing direction there is an opening that during the burning of the "lamps" by a cover with the same paint how the inner surface of the hollow body is closed »if after sufficient To get used to light, the lamps are switched off, the cover removed and a slide in the form of a slide is given to the examined person presented for a short time * For this purpose, the sign is presented from behind durehleuohtet by means of an incandescent lamp; provide light-scattering agents for even brightness *

Opiisdie Werbe G. Rodenstoiit Munich Sheet ^fc to the letter of

It signifies an essential salvation of the invention that during the An Idttsen couple looking at the iest mark in front of the eyes of the examined person., similar to glasses, brought? ard »that the iestzeichen im Makes it appear infinite or at a different distance «One The opening on the side of the adaptometer allows the person carrying out the examination! to observe the eyes of the person being examined »

In order to have the same sequence of several 2! it ta calibrate comply _f the characters are erfindujigsgemäß · on a movable support "such as a _{Hevölverscheibe;} , arranged, which is rotated intermittently. Pie characters Wimen can be distinguished by different sizes * by different brightness, different threatening position or also by different contrast »provided they do not appear light on a darker background, but gray in a lighter environment» Pie brightness can through. Neutral density filters or other light attenuation means can be varied »Can you also work with a single symbol? ^{Then a sequence of U} filters, a gray wedge or some other known variable light attenuating agent is used to regulate the brightness. A single., Several or all of the remaining signs can be set up to be rotatable * even * if they are interchangeable on a movable:,! Rager * The contrast of a sign can be »for example by 3? be variable *.

In each case the ■ lobster or some other signal and given- * if ^ rehlage * Brightness and contrast of the displayed character on the outside made visible, for example by attached to the Eevälversoheibe Mffern that appear to the outside in an opening in the housing.

A further important main part of the invention is a mechanical transmission * which is controlled by a clock * so that initially for a longer period of time, for example 12 minutes, the "lamps" switched on that illuminate the cavity of the adaptometer. Meanwhile the person to be examined looks uninterruptedly to get used to the hill into the cavity * Then the lamps are extinguished and the first! test sign for a certain short time, about a second. " presented * At intervals of further intervals of, for example, half a Minute further ^ es ta cal / also briefly shown; approximately by switching on the lamp assigned to them »In particular, here the time switch can be replaced by an electric synchronous motor

Munich

Sheet 'Λ to the letter of

the one who changes the 2nd at the same time with a device known per se, for example a Maltese cross gear * laughing after the examination of a person has expired »the device is automatically shut down, but can be switched on again by pressing a button * In particular, that can Switch on by pressing on the chin or forehead rest. Instead of spreads or prints made as backlit slides, it is also possible to use spreads or prints made of imminescent substances, which are stimulated by a preparation emitting gamma rays be generated. A light source for candling is omitted then.;, The 'estjsei ** ohen only Kurae T im _e siohtbait? su make * a flap can be provided in front of them, which - for example electromagnetically - is removed for a short time.

In Pigur an adaptometer according to the invention is shown schematically in 5-round plan has been reproduced »

With the switch 1, the electric motor 2, advantageously a synchronous motor having untersetzendem G-etriebe ^, energized * of the gear 4 with the second screw 5 and the second gear 6, the file 7 and superimposed on the screw 3 in rotation being one revolution thereof etwa- take 1R> minutes m ^ ÖGE, on the f _€ ll ^ 7 is, a switching disc 8 which has to about two thirds of its circumference a contact path 9 * the pressure switch 10 ist.also gür geschlössen about 10 minutes : and thereby energizes the lamps 11. They illuminate the inside of the hemispherical "housing 12, so that the visual field for the eyes 13 of the examiner is fully illuminated." At the same time, the magnet 14 lifts the lenses 15 out. the field of vision of the examined! the mechanical transmission links for this were not drawn.

As soon as the. movable "£ ^p eder des Behaltejrs 10 γοη && τ contact track 9 expires * it touches the contact 16 so that the lamp 18 over the contact 17 attached to the wheel 4 for a short 2ext, about one second» receives voltage and lights up »the electrical lines were not drawn in detail.

Munich

Sheet 4 to the letter of

At the same time, with the back of the contact 10, the pin 19 attached to the switching disk 8 engages in a slot of the Maltese cross $ 0, which is located on the shaft 21 and has as many slots as there are on the hydraulic lever 22 Including the corner cover ZJ _f which closes the opening 24 housing 12 * as long as the lamps 11 are on * By the grip of the pen 10 in the cross 20, the cover 25 is replaced by a symbol adjacent to it on the evolversive disk 22. During the already described brief lighting up of the lamp 18, it is transilluminated and presented to the eyes 15 of the person to be looked for.

During the rotation of the disk 4 * which lasts about half a minute, the next pin 26 attached to the switching disk 8 engages in the slot of the Maltese cross 20 assigned to it and switches the next © Test switches 27 in front of the opening 24 «This gate passage is repeated until all ίΕ es ta calibrate are presented and the cover 23 again seen in front of the opening 24, at this moment the examination is taking place completed; the switch 1 is by hand or in a known? and. therefore, not shown, opened by a curl, the is connected to WgIIe f, - :.

Claims (1)

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