Vision Tester Dual Lens Disk Segmentation
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Solution Overview
Problem
Existing vision testers face accommodation interference due to a narrow visual field, which is exacerbated by larger optical elements needed to widen the field, resulting in an increased size of the apparatus.
Innovation Solution
A vision tester design featuring a pair of lens chamber units with two lens disks of equal diameter, where the second lens disk has larger apertures than the first, providing a viewing angle of 40° or more without increasing the apparatus size, by strategically placing optical elements and auxiliary lenses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the test window and optical elements have larger diameters to widen the visual field, then accommodation interference is reduced, but the lens disk diameter and main unit size increase
Solution Approach 1:
The patent divides the optical system into two separate lens disks of equal diameter, with optical elements on the first disk and larger apertures on the second disk. This segmentation allows the visual field to be widened through the larger apertures without requiring the optical elements themselves to be larger, thus preventing an increase in main unit size while reducing accommodation interference
Solution Approach 2:
The patent applies different diameters to different parts of the lens disk system: the optical elements have one diameter while the apertures have a larger diameter. This local quality differentiation allows the apertures to control the visual field width without the optical elements needing to be correspondingly large, resolving the contradiction between visual field width and apparatus size
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design effectively reduces accommodation interference while maintaining a compact size, ensuring a wider viewing angle for accurate refractive power measurement without the need for larger components.
Implementation Method 1
a pair of right and left lens chamber units 2 each having a test window 4; a first lens disk provided with an aperture and a plurality of optical elements
Data Source
AI summary
A subjective vision tester includes a pair of right and left lens chamber units (2) each having a test window (4), a first lens disk (11-14) provided with an aperture and a plurality of optical elements (110, 120, 130, 140) and placed in a position closer to an examinee's eye (E) within the each lens chamber unit, and a second lens disk (15, 16) provided with an aperture (151, 161) and a plurality of optical elements (150, 160) and placed in a position farther from the examinee's eye than the first lens disk within the lens chamber unit. The first lens disk and the second lens disk are equal in diameter. The diameter of the diameter of the aperture in the second lens disk is larger than each optical element in the first lens disk.