Images of the smallest cone photoreceptors in the retina, with colour added to represent the different wavelengths of light used to capture the images after compensating chromatic aberration.

Able to make readings in the 10-pA range with less than 1% uncertainty, the S471 handheld optometer displays readings digitally and with an analog bar. It can also output data digitally via an RS-232 ...

measurement range of 0.1 pA to 2 mA. Features include an adjustable sampling time, continuous offset off the pretrigger light level, and autoranging with storage of the last setting.

WASHINGTON -- Researchers report a new imaging system that cancels the chromatic optical aberrations present in a specific person's eye, allowing for a more accurate assessment of vision and eye ...

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Designed and configured for all LED measurement requirements, UDT Instruments’ optometer features microprocessor control and three measurement data-presentation options: direct display measurement ...

Scientific American is part of Springer Nature, which owns or has commercial relations with thousands of scientific publications (many of them can be found at www ...