DEP0050835DA - Ophthalmic device with a red-free filter - Google Patents
Ophthalmic device with a red-free filterInfo
- Publication number
- DEP0050835DA DEP0050835DA DEP0050835DA DE P0050835D A DEP0050835D A DE P0050835DA DE P0050835D A DEP0050835D A DE P0050835DA
- Authority
- DE
- Germany
- Prior art keywords
- red
- ophthalmic device
- filter
- free filter
- eye
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 230000005855 radiation Effects 0.000 claims description 6
- 238000005286 illumination Methods 0.000 claims description 2
- 238000011835 investigation Methods 0.000 description 2
- 230000001575 pathological effect Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 210000003462 vein Anatomy 0.000 description 1
Description
Ojphthalmolüsischep Gerät mit Bo'tfrei-FilterOjphthalmolüsischep device with bo't-free filter
In de^ Augenheilkunde ist es "bekannt, die Untersuchung des Augeninneren bei einer sogenannten Rotfrei-Beleuchtung vorzunehmen, um dadurch bessere Kontraste« Z9Bi, auf dem von roten Adern durchzogenen AugenhintergruncL.,. zu erzielen» Zu fiesem Zweck wurde bisher in den Beleuchtungsstrahlen-· gang des ophthalmolpgischen Gerätes, a»B„ des Augenspiegels 9 ein filter eingeschaltet % das die rote Strahlung mehr oder weniger absorbiert, während alle anderen Wellenlängen des Spektrums durchgelassen wurden? Wie die der 'Erfindung zu Grunde liegenden Untersuchungen ergeben habenp ist aber gerade die bisher nicht herausgefilterte Blaustrahlung für eine gute KontrastWirirung schädlich,, da blaues Licht von den inneren Medien des Auges besonders stark; f^stlMlut wird und eine fiffuse Grundhelligkeit im Bild erzeugt«.In de ^ ophthalmology it is "known to carry out the investigation of the interior of the eye at a so-called red-free illumination, thereby better contrast" Z 9 Bi to achieve on the criss-crossed by red veins AugenhintergruncL.. "Too nasty purpose has been in the Beleuchtungsstrahlen- · transition of ophthalmolpgischen device, a "B" of the ophthalmoscope 9, a filter switched%, the red radiation more or less absorbed, while all other wavelengths of the spectrum were transmitted How have revealed that of the 'invention underlying investigations p But it is precisely the blue radiation, which has not yet been filtered out, which is harmful to good contrast, since blue light from the inner media of the eye is particularly strong;
Um diesen Fachte.il zu vermeiden* wird bei ophthalrn.ologlsc.hen Geräten, das !Filter gemäß der .Erfindung so ausgebildet s daß es außer der Rot strahlung auch alle. Blaustrahlung absorbiert* Die Praxis hat gezeigt, daß dadurch die Kontraste.; insbes-ondere dea Augenhint ergrundes, gegenüber ien üblichen Botfre^Ifiltern gesteigert werden * wao wiederum iem Ar-zt das Erkennen krankhafter Erscheinungen im Auge wesentlich erleichtert„ .In order to avoid this technical part * in ophthalmic devices, the filter according to the invention is designed in such a way that it not only absorbs red radiation, but also all. Blue radiation absorbed * Practice has shown that this results in the contrasts .; In particular, the background of the eyes, compared to the usual botfrequency filters, are increased * which, in turn, makes it much easier for the doctor to recognize pathological phenomena in the eye.
Der durch dan engeren Durahlassbereioh dieses,Filters bedingte Helligkeitsverlust ist in der Praxis.,, insbesondereThe loss of brightness caused by the narrower range of this filter is in practice. ,, in particular
bei den modernen lichtstarken ophthalmölogischen Geräten, ohne Bedeutung und wird durch die erzielte Kontraststeigerung bei weitem aufgehoben*in modern, high-intensity ophthalmic equipment, it is of no importance and is due to the increase in contrast achieved far removed *
Claims (1)
Family
ID=
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