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Eyewear and smart glass quality control with HASO Shack-Hartmann wavefront sensor - VIS NIR optical metrology Application Notes

Eyewear and smart glass quality control with HASO Shack-Hartmann wavefront sensor - VIS NIR optical metrology Application Notes
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Eyewear and smart glass quality control with HASO Shack-Hartmann wavefront sensor - VIS NIR optical metrology Application Notes - 1

Eyewear and smart glass quality control with HASO Shack-Hartmann wavefront sensor Imagine Optic, 18 rue Charles de Gaulle, 91400 Orsay, France contact@imagine-optic.com Introduction Eyewear is an essential protection for activities in which the motion is basically faster than a regular walk or if the evolution is made through a different media than air such as water. In activities such as swimming, scuba diving, skiing, mountain biking, shooting, our eyes have to be protected against projections, insects, dust or cold. The eyewear such as snow goggles, safety glasses, colored or not, are protecting our precious eyes against natural threats. The quality of the optics can affect the vision quality and cause ocular fatigue and associated consequences such as headache. Also other wavefront distortions such as astigmatism can affect peripheral vision, cause discomfort and potentially put the safety of the wearer at risk. In the past few years smart glasses have been made accessible to mass market. Those devices offer several features including hands-free access to all sorts of information directly related to the eye, potentially improving user’s safety for a number of applications, professional or not. While reducing the production costs, manufacturers of this type of optical systems have to follow some quality standards defined for safety eyewear by norms such as - EN166: European Standards for Eye protection ANSI/ISEA Z87.1: Eye protection from The American National Standards Institute SANS 1404: Eye-protectors for industrial and non-industrial use in South Africa Accuracy of vision is one of the four optical clarity classes. It qualifies image distortion through eyewear. The highest level of optical clarity or correctness is defined as Class 1 (0.06 diopters), which insures perfectly clear vision1). Shack-Hartmann (SH) wavefront sensor is a real-time compact and robust optical metrology tool for measuring the aberrations (imperfections) present in a light beam, or an object that light passes though or is reflected from. TheEyewear and technique is well known for its high accuracy SH detection smart glasses quality control N.Varkentina and rapidity. The sensor is constructed with a microlens array in front of a CCD camera. 1 / 4 imagine-optic.com 22 October 2020 – Property of Imagine Opti

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Eyewear and smart glass quality control with HASO Shack-Hartmann wavefront sensor - VIS NIR optical metrology Application Notes - 2

Spiral test is one of the optical clarity determination techniques. This method is performed to locate and characterization of the eyewear under test. The eyewear assess local prismatic deviations in order to obtain a is then conjugated onto the microlense array of the SH refractive profile across the entire surface. It can be time- consuming test. In this application note we describe how a Shack-Hartmann wavefront sensor (SHWFS) can Collimating be used to perform a quick and quantitative assessment of the optical quality of eyewear. SHWFS is a tool of reference in optical metrology. It is...

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Eyewear and smart glass quality control with HASO Shack-Hartmann wavefront sensor - VIS NIR optical metrology Application Notes - 3

A ski goggle or snowboard screen is usually bent with a substrate structure. The light guide (see Figure 4) is strong curvature to protect your eyes and at the same placed at the object plane of the optical setup as shown time give visibility for wide angles. The bending process or previously. The HASO measures the wavefront and framing can induce some defocus in the center of the intensity profiles of the beam after its propagation vision area (middle of goggle). This defocus is precisely through the optics. The phase distortion is quantified, determined, thanks to the use of Zernikes...

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Eyewear and smart glass quality control with HASO Shack-Hartmann wavefront sensor - VIS NIR optical metrology Application Notes - 4

Specifications” EN 166:2001 (2002). 2) D. Dai, “Wavefront optics for vision correction” (SPIE, 2008), Chap.3. Eyewear and smartglass quality control Application note Imagine-optic.com 22 October 2020 – Property of Imagine O

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