Did You Know...
...that Charles Goodyear performed some of his experiments on rubber while in debtor's prison? He was there so often he referred to it as his "hotel". Chronically in debt because of poor business sense and ill health, Goodyear depended on the generosity of friends and family. Even after he unlocked the secret to vulcanizing rubber, he was unable to improve his financial situation. When he died, his estate was $200,000 in debt.
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| Number | Title | Issue Date |
| 5638150 | Hand-held slit lamp apparatus and associated methods A hand-held lamp instrument has a substantially elongated handle that houses one or more batteries and that connects to a line filament lamp. A front knob is threaded to the handle so that it is rotatable about the elongated axis of the handle. The front ... | 06/10/1997 |
| 5629747 | Hand-held ophthalmological apparatus having a retractable forehead contact member A hand-held ophthalmological apparatus comprises a measuring unit for measuring an examinee's eye, a hand unit attached to the measuring unit and held by a measurer and a forehead contact member for contacting a forehead of the examinee. The apparatus mai... | 05/13/1997 |
| 5599276 | Diopter value viewing means for a video ophthalmoscope There is a hand-held opto-diagnostic medical system comprising a medical instrument including a housing having an optical passage through the housing and a light source for illuminating the target area. The medical instrument has a plurality of optical le... | 02/04/1997 |
| 5585873 | Automated hand-held keratometer An automated portable keratometer includes a hand held housing and is battery powered. A projection system projects collimated light sources at equal converging angles to an optical axis which extends outside the housing. A camera, including an imaging de... | 12/17/1996 |
| 5528323 | Ophthalmic apparatus including hand-held measuring device and wireless data transmission An ophthalmic apparatus is provided with a measurement unit that includes a measurement device that projects measurement light onto an examinee's eye and detects the measurement light reflected by the examinee's eye, a grip that supports the measurement d... | 06/18/1996 |
| 5500698 | Optical instruments such as retinoscopes which may incorporate multiple lens assemblies and methods of calibrating such instruments Techniques and retinoscopic apparatus for measuring or determining a patient's optical error are disclosed. The techniques include overrefraction and can be performed from a fixed position, avoiding the practitioner's need to move back and forth relative ... | 03/19/1996 |
| 5459535 | Compact telescoping retinoscope The present invention is directed to a compact retinoscope which telescopes to a closed position in order to allow the instrument to be stored in a pocket or pocket carrying case. As the instrument body or head is pushed downward to its closed position, a... | 10/17/1995 |
| 5202710 | Fixation card attachment for retinoscope A fixation card attachment for an eye examination instrument that enables the card to be positioned in reference to the optical path of the instrument so that the patient undergoing examination must refocus his or her eye when reading indicia on the card.... | 04/13/1993 |
| 5052795 | Measuring ophthalmoscope and ophthalmoscopic procedure An ophthalmoscopic procedure and ophthalmoscope for quantitative measurement of fundus structures and, in particular, the area of neuroretinal rim are disclosed. Using an ophthalmoscope, a diverging beam of light is projected at a selected fundus structur... | 10/01/1991 |
| 4998818 | Ophthalmoscope with linear polarizer An ophthalmoscope is provided with a slidably mounted rack which carries two polarizing filters mounted at right angles to each other so as to simultaneously position one filter in the light path and the other in the viewing path. The rack also carries a ... | 03/12/1991 |
| 4856892 | Ophthalmoscope The invention relates to an ophthalmoscope for indirect ophthalmoscopy. The device contains a light source, a vertically movable condenser and a mirror--preferably--vertically movable. A lens carrier including a set of lenses can be affixed at will to the ... | 08/15/1989 |
| 4643546 | Ophthalmoscope with automatic lens shifting mechanism An ophthalmoscope having two lens discs one of which has three different lenses and the other of which has twenty-three different lenses. There is a viewing path through the instrument and, in use, one lens in each disc will always be in registry with the... | 02/17/1987 |
| 4577943 | Method and apparatus for self-examination of the ocular globe A method of self-examining the interior of the ocular globe by applying a light source to the outer surface of the lower eyelid, with the eye closed in order to permit the entrance of the light from said light source only through the thickness of said low... | 03/25/1986 |
| 4538889 | Manual ophthalmoscope The inventive manual ophthalmoscope is provided with a housing 1 which is closed on all sides and in which the optical components 7, 8, 9, 13, 14 are housed in an entirely dustproof manner. The necessary switching operations for interposing correction len... | 09/03/1985 |
| 4514062 | Instrument for indirect ophthalmoscopy and electrical energy producing means therefor An ophthalmoscope for observing the fundus of an eye includes a casing, a light source for illuminating the fundus, lens means for viewing the illuminated fundus, electrical energy producing means for providing electrical energy to the light source and me... | 04/30/1985 |
| 4272165 | Optical system for illuminating the ground of the eye The invention contemplates an improved optical system for illuminating the retina or ground of the eye and having particular application to a hand-held ophthalmoscope. The optical system, thus embodied, permits selective modification of image scale, for a... | 06/09/1981 |
| 4166677 | Illumination system for indirect ophthalmoscope The invention relates to a lighting appliance for generating a light beam for indirect ophthalmoscopy which appliance comprises a housing with a beam outlet aperture through which the beam leaves the housing and first and second means in the housing to re... | 09/04/1979 |
| 3936161 | Ophthalmoscope illumination arrangement This application discloses an ophthalmoscope illumination arrangement including a bulb mounted in a special bulb carrier which is adapted to cooperate with the ophthalmoscope chassis so as to automatically position the bulb for best illumination. The bulb... | 02/03/1976 |
