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Entoptoscopic instrument for observing the interior of an eye

Image Number 2 for United States Patent #5335648.

An entoptoscopic instrument (10) comprises a light source unit (20), a light transmitting member (30), and a mirror member (40). The light source unit (20) comprises a filter for cutting off harmful wavelength components from illumination light to restrict the wavelength components of the illumination light to a range between 440 nm and 880 nm.

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