The Shack-Hartmann grid (Hartmann-Shack) is a wavefront aberrometer or sensor. The design of the sensor was based on tool created by Johannes Franz Hartmann in 1900.
The Shack-Hartmann grid are sensors that capture refractive errors.
Red Dots =Shack Hartmann Grid
To capture the best images, guide the patient's eyes on the target so that the red dots are centered within the circle.
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