IMPROVED OBJECTIVE PHOROPTER
An objective phoropter utilizes an illuminated keratometric object projecting its illumination onto the subject's cornea, and images the reflection therefrom in an imaging camera. Image processing ofthese images is used to improve the focusing and centering of the cornea subject's eyes. On...
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Zusammenfassung: | An objective phoropter utilizes an illuminated keratometric object projecting its illumination onto the subject's cornea, and images the reflection therefrom in an imaging camera. Image processing ofthese images is used to improve the focusing and centering of the cornea subject's eyes. Once the correctly focused position of the eyes is obtained relative to the keratometer object, an accurate longitudinal position of the eyes relative to the lens wheel assemblies can also be achieved. This results in more accurate prescription generation than in prior art systems where the eyes may not be accurately positioned relative to the lens wheels. Additionally, the lens combinations of the entire phoropter wheel can be calibrated using an artificial eye having adjustable levels of aberration. Eachlens combination is adjusted to supposedly correct a selected aberration level, and any residual aberration measured represents the correction to be applied to that lens combination.
种客观式综合验光仪,利用将其光照投射在受试者的角膜上的发光的角膜曲率物体,并对来自受 |
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