Optical Lens Head Freedom Area Determination
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Solution Overview
Problem
Traditional optimization processes for optical lenses consider only one gaze direction and head posture, limiting the range of head positions a wearer can adopt without compromising optical performance, which increases muscle stress and reduces comfort.
Innovation Solution
A device and method for determining the head freedom area of an optical lens, which involves obtaining optical lens data, wearing data, and specific threshold values for optical performance criteria, and using a processor to determine the head positions that maintain optical performance above the threshold, thereby defining the head freedom area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional optimization process considers only one gaze direction, then optical performance at that specific point is optimized, but the range of acceptable head positions is limited
Solution Approach 1:
The patent segments the evaluation process by dividing the head freedom area into multiple discrete head positions (e.g., 5-10 positions) around a reference head position. Each position is evaluated independently for optical performance, allowing the system to identify acceptable zones while maintaining optimization precision at each segment.
Solution Approach 2:
The patent transitions from evaluating a single gaze direction (1D) to evaluating multiple gaze directions across multiple head positions (3D space). By adding spatial dimensions (azimuth and elevation angles), the system expands from point-optimization to volume-optimization of the head freedom area.
2Measurement precision
If traditional optimization uses fine-tuned head posture control, then optical performance is maintained, but muscle stress in neck and shoulders increases
Solution Approach 1:
The patent introduces dynamic evaluation by assessing optical performance across multiple head positions rather than a fixed posture. This allows the system to identify flexible zones where head movement is permitted without compromising optical performance, reducing the need for rigid posture control and associated muscle stress.
Solution Approach 2:
The patent changes the evaluation parameters from a single fixed gaze direction to multiple gaze directions defined by azimuth and elevation angles. By varying these parameters across a range of head positions, the system identifies acceptable postural variations that reduce muscle stress while maintaining optical performance above threshold values.
3Ease of manufacture
If optical lens is optimized for a single point, then manufacturing and design is simplified, but the lens does not accommodate multiple gaze directions
Solution Approach 1:
The patent creates a multi-functional optimization approach where the lens design process evaluates performance across multiple functions (multiple gaze directions and head positions) simultaneously. The head freedom area determination serves as a universal metric that validates performance across diverse viewing conditions, making the lens adaptable to various head positions while maintaining a systematic design process.
Data Source
AI summary
A device for determining a head freedom area of an optical lens adapted for a wearer looking at a specific point in a scene through the optical lens comprises at least one input adapted to obtain optical lens data representing the optical features of an optical lens, to obtain wearing data and fitting data representative of the wearing conditions and fitting parameters of the optical lens, and to obtain a specific threshold value for an optical performance criterion; and at least one processor configured for determining the head freedom area that corresponds to the head positions of the wearer that provide optical performances greater than or equal to the specific threshold value when the wearer is wearing the optical lens in given wearing conditions upon given fitting parameters and looking at the specific point in the scene through the optical lens.