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Monovision is a common prescription lens correction for presbyopia. With monovision, each eye is corrected to focus light from a different distance, causing one image to be blurrier than the other. The brain suppresses the blurrier image and preferentially processes the sharper one, thereby expanding the depth of field. This differential blur that occurs between the lenses results in a motion illusion that makes people misperceive the distance and directional movement of three-dimensional objects. This depth misperception has been coined as the reverse Pulfrich effect.
By tinting the lens that causes the blurry image, the depth misperceptions will be eliminated. This non-invasive technique has been shown by measuring how blur differences affect neural processing times with sub-millisecond precision.
Currently, the biggest challenge with monovision corrections comes from the decrease in stereovision and depth misperceptions. The ability to eliminate depth misperceptions enables a new branch of “premium monovision corrections” that will have a positive impact in the prescription of this type of corrections.