1
Steven R Slawson, Ronald A Hauptli, Chris R Roberts, Allan I Krauter, Ervin Goldfain: Focusing mechanism. Welch Allyn, Wall Marjama & Bilinsk, May 21, 2002: US06390625 (142 worldwide citation)


A focusing mechanism for an optical instrument includes an eyepiece having at least one lens element retained within an eyepiece housing, a stationary carrier for retaining the eyepiece, and a rotatable thumb wheel. A pair of levers operatively connect the eyepiece housing with the rotatable thumb w ...


2
Corinn C Fahrenkrug, Ervin Goldfain, Andrew J Kugler, David G Perkins, Howard A Haines III, William N Cuipylo: Compact ocular measuring system. Welch Allyn, Wall Marjama Bilinski & Burr, December 28, 1999: US06007204 (61 worldwide citation)


Apparatus for determining refractive aberrations of the eye of a patient includes an instrument housing having a light source for projecting a substantially focused beam of light at the back of the eye of a patient, said substantially focused beam acting as a secondary source for a return light path ...


3
Ervin Goldfain, Jon Salvati, David Fallat, Marcia Wawro, Michael McMahon: Digital documenting ophthalmoscope. Welch Allyn, April 29, 2008: US07364297 (51 worldwide citation)


The invention is an eye viewing device having an eyepiece at an observer end thereof and an imaging element at an observation port thereof. Light that is reflected from an imaged eye of a patient is provided to either or both of the eyepiece and the imaging element. A practitioner can view the image ...


4
William H Havens, Ynjiun P Wang, Vivian L Hunter, Allan I Krauter, Ervin Goldfain, Raymond A Lia, Richard W Newman, Thomas W Karpen, Bradford Morse, Dongmin Yang: Data reader apparatus having an adaptive lens. Additon Higgins Pendleton & Ashe P A, December 31, 2013: US08616454 (18 worldwide citation)


Systems and methods for making and using handheld data readers comprising one or more fluid lenses. One or more fluid lenses are provided to allow a handheld data reader to perform such operations as reading indicia, including such additional operations as zooming, reorienting a viewing direction, f ...


5
Ervin Goldfain, William Lagerway, Chris R Roberts, Steven R Slawson, Allan I Krauter: Eye viewing device for retinal viewing through undilated pupil. Hand Held Products, Wall Marjama & Bilinski, June 25, 2002: US06409341 (15 worldwide citation)


The invention is a low cost, low input power eye viewing device well suited for viewing wide field retinal images through an undilated pupil. Included in the device are a converging light illumination system and an aperture stop. The converging light illumination system provides ease of entry of lig ...


6
Ervin Goldfain, Chris R Roberts, Allan I Krauter, Steven R Slawson, William H Lagerway: Eye viewing device for retinal viewing through undilated pupil. Welch Allyn, George S Blasiak, Wall Marjama & Bilinski, October 28, 2003: US06637882 (11 worldwide citation)


The invention is a low cost, low input power eye viewing device well suited for viewing wide field retinal images through an undilated pupil. Included in the device are a converging light illumination system and an aperture stop. The converging light illumination system provides ease of entry of lig ...


7
Ervin Goldfain, William Lagerway, Chris R Roberts, Steven R Slawson, Allan I Krauter: Ophthalmoscope comprising defocused light source. Wall Marjama Bilinski & Burr, May 23, 2000: US06065837 (10 worldwide citation)


The invention is an ophthalmoscope having an imaging path and imaging axis which includes a light source disposed in the imaging path at or in proximity with the imaging axis. Disposing the light source directly in the imaging path at or in proximity with the imaging axis provides numerous illuminat ...


8
Dominick Danna, Allan I Krauter, Robert L Vivenzio, Dale C Saddlemire, Michael T McMahon, Ervin Goldfain: Welch Allyn, Hiscock & Barclay, April 17, 2012: US08157728 (9 worldwide citation)


A vaginal speculum includes an upper blade member and a lower blade member that is movably connected with respect to the upper blade. The lower blade member includes an integrated handle portion having a receiving cavity configured for interchangeably receiving one of a first illumination assembly a ...


9
Ervin Goldfain, Steven R Slawson, Eric M Andreassen, Cynthia A Kuiper, Elizabeth P Staples, Raymond A Lia: Otoscope. Welch Allyn, July 15, 2008: US07399275 (9 worldwide citation)


An otoscope permitting examination of a patient's ear is defined by an instrument head including a proximal end and a distal insertion portion that is insertable into the ear. The otoscope includes an imaging lens train disposed within the instrument head, wherein each of the imaging lens train, an ...


10
Ervin Goldfain, Daniel C Briggs: Medical diagnostic instrument with variable focus liquid lens. Welch Allyn, Hiscock & Barclay, Stephen Rosenholm, June 30, 2009: US07553020 (8 worldwide citation)


A diagnostic instrument includes an illumination system for providing illuminating light and an imaging system for directing the illuminating light to a target and for transmitting light reflected from the target to a viewing location. The imaging system includes an electrically controllable variabl ...



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