Method and system for measuring optical characteristics of a contact lens
A contact lens, strength measurement technology, applied in the direction of testing optical properties, optics, optical components, etc., can solve the problem of inability to accurately reproduce real world conditions
Active Publication Date: 2020-09-15
TRANSITIONS OPTICAL INC +1
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- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Existing methods of maintaining activation under laboratory conditions, such as exposing photochromic contact lenses to xenon-arc lamps, may not accurately reproduce real-world conditions
Method used
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Experimental program
Comparison scheme
Effect test
example 1
[0095] Example 1 involves measuring the transmittance and absorbance of photochromic contact lenses in an outdoor environment.
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Abstract
A method of determining the transmittance of a contact lens (200) includes the steps of obtaining a measurement of a first intensity of electromagnetic radiation reflected by ocular surface (100) withan intensity measuring device (400), positioning the contact lens (200) in direct contact with the ocular surface (100), obtaining a measurement of a second intensity of electromagnetic radiation transmitted through the contact lens (200) that is reflected a region (110) of the ocular surface (100) that is covered by the contact lens (200) with the intensity measuring device (400); and calculating the transmittance using the measurements of the first intensity and the second intensity.
Description
technical field [0001] The present invention relates to methods and measurement systems for determining optical properties of contact lenses, such as photochromic contact lenses, under real world conditions. Background technique [0002] Optical elements that absorb electromagnetic radiation in the visible region of the electromagnetic spectrum are used in a variety of items such as contact lenses. A "contact lens" is expressly defined herein as a device that physically resides in or directly on the eye. "Directly on" means "in direct contact with". It should be understood that the terms "directly on" and "in direct contact with" also include the presence of a tear film between the contact lens and the eye. [0003] Contact lenses that absorb electromagnetic radiation improve the viewing comfort of the wearer and enhance the wearer's ability to see in bright conditions. Examples of contact lenses that absorb electromagnetic radiation include fixed tint contact lenses and ...
Claims
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IPC IPC(8): G01M11/02G01N21/19G02B1/04G02C7/04G01N21/958
CPCG01M11/0285G02B1/043G01N21/59G01N21/958G02C7/04G01N2021/9583G01M11/0235G02C7/102
Inventor F·R·布莱克伯恩J·黑兹尔P·马丁
Owner TRANSITIONS OPTICAL INC