Continuous Optotype Size Adjustment for Visual Acuity Testing

The patent transforms the static sequential presentation of optotypes into a dynamic continuous size change of a single optotype. The optotype size changes continuously from large to small (or vice versa) while the client provides feedback, allowing the system to dynamically determine the threshold size. This dynamic approach replaces the time-consuming sequential presentation with a continuous transformation process that achieves the same measurement goal much faster.

The patent implements continuous useful action by maintaining an uninterrupted size transformation of the optotype throughout the testing process. Instead of presenting discrete optotypes sequentially with pauses for identification, the system continuously transforms the optotype size while the client provides continuous feedback. This continuous process eliminates idle time and accelerates the testing while maintaining measurement accuracy.

The patent replaces complex mechanical optotype presentation systems with a projector-based optical system. Instead of using multiple physical optotype charts or complex mechanical devices to present different sized optotypes sequentially, the system uses a single projector with zoom capability to optically transform the size of a single computer-generated optotype. This substitution of mechanical systems with optical/electronic systems achieves the continuous size change function while reducing overall mechanical complexity.

The patent achieves continuous size transformation by changing the optical parameters of the projector system, specifically the zoom factor. By continuously adjusting the zoom parameter of the projector, the system transforms a single optotype image into multiple effective sizes without requiring multiple physical optotypes or complex mechanical adjustment mechanisms. This parameter-based approach simplifies the device while enabling continuous size change functionality.