Difference between revisions of Blur
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A normal healthy eye can experience blur by looking at images through lenses or mirrors that cannot be cleared by [[accommodation]]. | A normal healthy eye can experience blur by looking at images through lenses or mirrors that cannot be cleared by [[accommodation]]. | ||
A common description of spherical (myopic or hyperopic) blur is that it looks like [[wikipedia:Gaussian blur | Gaussian blur]]. | A common description of spherical (myopic or hyperopic) blur is that it looks like [[wikipedia:Gaussian blur | Gaussian blur]]. Note that spherical defocus can also cause double vision, not just blur. | ||
A good [[normalized]] creates some blur or double vision challenge for distant objects, but objects that are slightly closer are clear. A good [[differential]] creates some blur or double vision challenge near the ergonomic working distance. They should be determined by calculating [[diopter]]s and [[cm]], but a normalized is typically 20/20 to 20/50, and a differential is typically 20/40 to 20/150. | A good [[normalized]] creates some blur or double vision challenge for distant objects, but objects that are slightly closer are clear. A good [[differential]] creates some blur or double vision challenge near the ergonomic working distance. They should be determined by calculating [[diopter]]s and [[cm]], but a normalized is typically 20/20 to 20/50, and a differential is typically 20/40 to 20/150. | ||