Abstract
All known methods of wide-angle observation of the fundus deliver an inverted image. To overcome these difficulties a stereoscopic diagonal inverter (SDI) was developed, which serves as an accessory to the operating microscope. This device permits the microscopic image to be vertically inverted and laterally reversed, while retaining full stereopsis, and thus makes wide-angle observation devices such as the Rodenstock Panfundoscope contact lens (150 degrees) and a modified version of the binocular indirect ophthalmoscope (70 degrees-90 degrees) usable in vitreous microsurgery.
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