Eye Diameter Measurement Using Adjustable-Focus Camera Calibration

The patent extracts the distance control function from a complex specially designed box and implements it through a simple distance scale object placed next to the eye. The box's multiple functions (distance control, illumination control) are separated and simplified into individual components, making the system less complex while maintaining measurement precision.

The patent introduces a distance scale object as an intermediary element between the camera and the eye. This mediator provides a known reference size that enables conversion of pixel measurements to physical units without requiring complex distance control mechanisms, thus reducing system complexity while maintaining precision.

The patent merges the distance scale object with the eye measurement process by capturing both in a single image. The distance scale object is positioned next to the eye during the same measurement session, eliminating the need for separate calibration steps and auxiliary objects, thus improving ease of operation while maintaining precision.

The distance scale object serves multiple functions: it provides a reference for size conversion, indicates the focal plane, and can be captured in the same image as the eye. This multi-functionality reduces the number of separate operations needed, making the measurement process simpler while maintaining absolute measurement precision.

The patent replaces the mechanical contact regime with a non-contact optical imaging system using a mobile camera. Instead of physical contact with the eye surface, the system uses optical focusing and image processing to measure anatomical features, thereby maintaining precision while greatly improving adaptability to different environments including home and clinical settings.

The patent changes the measurement approach from contact-based mechanical measurement to non-contact optical measurement. By using a mobile camera with adjustable focus and processing the captured images through algorithms, the system achieves comparable precision without the limitations of contact regime, enabling use in diverse environments.

The patent replaces expensive and potentially harmful pulsed laser beams with a simple mobile camera system. Instead of using high-energy laser pulses that pose safety risks, the system uses standard visible light imaging, eliminating safety concerns while maintaining the ability to measure anatomical features through optical imaging and image processing.

The patent substitutes the laser-based optical system with a camera-based optical system. By using a mobile camera with adjustable focus to capture images of the eye and processing these images computationally, the system achieves the same measurement precision without the safety hazards and high cost associated with pulsed laser beams.