How does a lens free direct ophthalmoscope work?
Conventional direct ophthalmoscopes are used to examine the eye including viewing the retina. This can be useful when examining patients who present with possible eye injuries or sight defects. Early symptoms of serious medical conditions such as hypertension, diabetic retinopathies can also be detected with a direct ophthalmoscope. Like other direct ophthalmoscopes, the Optyse utilizes the cornea and the lens of the eye under observation to produce a magnified image of the retina. Patented features provide even illumination of the eye and reduce stray light and glare which can degrade image quality. The images obtained by the Optyse are non-inverted and the magnification is typically 15x, although the exact magnification will depend on the eye under observation. The design ensures that good quality retinal images can be obtained without the use of correcting lenses. However, the company recommends that if users normally need glasses for long-sighted vision, then they should leave thei
