Training: Assistive rehabilitation training services for people with low vision and blindness.  We go to our clients - home, school, or business - training where they need it - from caring assistive technology professionals. Click here to learn more.

The resolution of a camera is defined by the size of the smallest detail that the camera can optically discriminate. ISO standard 12233 defines the limiting resolution as the first frequency such that the contrast attenuation is 95% (hence a MTF value of 5%). In practice, this value is very small and is also sensitive to measurement noise

A useful diagram outlining the components that make up a traditional stereo microscope. Download PDF.

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The MTF precisely describes the contrast attenuation: for each spatial frequency, the MTF plots the ratio of the output modulation versus the test object modulation.

To learn more about how we can help you or a loved one, contact a Technology Specialist at New England Low Vision and Blindness today. You can call our toll-free number 888-211-6933 or email us at info@nelowvision.com and we will be happy to help.

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Lumin is an electronic magnifying glass for your iPhone or iPad. Not only does it magnify items, it can also keep a running history of images and can save or share these images with your friends via e-mail, Facebook, Twitter, and Instagram. Locked images can be magnified 10 times, or even more with ideal lighting, and can also be automatically mirrored to your Dropbox account.

Because of field aberrations (such as field curvature), the value of the limiting resolution and acutance depends on the field position.

Mr. Magnifier: If you or a loved one have been diagnosed with Macular Degeneration, our Mr. Magnifier handheld magnifiers are the perfect 1st Step for anyone with Macular Degeneration!  Here’s a link to very helpful information, including a free Magnification Guide – https://nelowvision.com/mr-magnifier-lp/

For the DxOMark sharpness score, we compute MTF in horizontal and vertical directions by examining the spatial response of the camera to a perfect edge. This measurement follows ISO standard 12233.

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New England Low Vision and Blindness offers training on these and other apps.  To learn more, contact a Low Vision Specialist at New England Low Vision and Blindness today –  email us at info@nelowvision.com or call our toll free number 888-211-6933.

Gloria Stuart is a Senior Assistive Technology Specialist and Trainer at New England Low Vision and Blindness.  Gloria is both an expert and user of low vision equipment providing assistive technology services to children and adults in RI and the New England region for more than 20 years.

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0 5-pin Cable for Camera/Camcorder - 3 ft. (USB-MiniBM-3FT).

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Magnifier works like a digital magnifying glass. It uses the camera on your iPhone to increase the size of anything you point it at, so you can see the details more clearly. Use the flash to light the object, adjust filters to help you differentiate colors, or snap a photo to get a static close-up.

Technology: We offer the latest and most advanced low vision and blindness technology supported by world-class personal service. We have nearly 100% of all major electronic low vision, blindness, and software products. Our complimentary, no-obligation demonstration on any of our products will make sure our clients are getting the right product for their specific eye condition. Click here to learn more.

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We map the acutance on a color scale as a function of focal length and aperture value. We make measurements for several field positions.

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SuperVision+ is the only magnifying glass app on the market that offers a supreme live image stabilization capability. Highly magnified images are usually shaking. It is a problem especially for old people. No more image shaking with SuperVision+ magnifier (magnifying glass).

LEICA DG VARIO-ELMAR lens for outstanding photographic performance throughout zoom ranges · Ultra telephoto zoom lens covering up to 1600 mm*2 for use in a wide ...

They are not letting anymore magnifier and flashlight apps in the app store because of the upgrades to the iPhones. But thankfully they kept this one. This app performs two basic tasks; magnification and illumination – someone said super powers for your eyes.  This app is really nice when you are trying to copy down a serial number or better still, get the SSID numbers off your router. It will light up the area using the flashlight and then use the magnification and the screen to enlarge the view.  You can take and picture and share it.

You know your iPhone it’s not just a big piece of toast you hold to your ear, it’s a magnifying glass in your pocket!  Who would have thought? Magnifier was built into the iOS 10 updates but many still do not know about it as it is somewhat hidden.  It lives in setting/accessibility. Once it is activated it turns your home button into the activation for the magnifier. It is pretty cool and relatively simple.  I found this video to help with the how to’s of turning on the magnifier. Enjoy!!! https://www.imore.com/how-use-magnifier-iphone-and-ipad#enable

The value of the MTF at frequency 0 is always 100% since a flat field is considered to have been reproduced perfectly, with no intensity loss. Attenuation due to lens transmission is measured separately.

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Well with great cameras built-in along with the apps you can install on your iPhone or iPad that can act as your magnifying glass.  I have found a few apps but with the update of the iOS 10 and great camera built-in, Apple added “magnifier” to its accessibility toolkit. Hope this helps!!!

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Note: The quality of the magnifier, including how closely it can focus on text and objects, will vary depending on the quality of the camera in your iPhone or iPad.

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We plot the acutance as a function of the radial field position, taking into consideration horizontal and vertical directions. We make measurements for several focal lengths and aperture values.

For the ultimate in telephoto performance, consider the 20-40X Zoom Telephoto Lens or the formidable 60X Super Telephoto Lens, each offering extraordinary ...

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The DxOMark score for Sharpness is based on the Perceptual Megapixel (P-Mpix) concept that weights the Modulation Transfer Function (MTF) of the lens with the human visual acuity. Read more about Perceptual Megapixels.

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DSLR lenses usually have a radial symmetry, which means that field dependency can be summarized by the MTF at different distances to the image center.

Free Low Vision Guide: If you or a loved one has been diagnosed with low vision, we have created this complimentary Low Vision Guide a free resource to help you or loved one who has been diagnosed with Macular Degeneration or other low vision conditions. Click here to download a PDF of the entire report.

An objective measure of sharpness which takes into account the sensitivity of the human visual system to specific spatial frequencies and the viewing distance of an image. Edge acutance refers to the ability of a photographic system to show a sharp edge between contiguous areas of low and high illuminance. Texture acutance refers to the ability of a photographic system to show details without noticeable degradations.

Developed By Massachusetts Eye and Ear this app has great stabilization, as well as the ability to hide the buttons to enable you to use the full screen, flash light support, auto focusing and snapshots can be saved and retrieved.  They have got it covered, very cool app really designed for the visually impaired in mind. Some of my students have used this app in the science/biology classes as a microscope, that’s how powerful it is. Nice and simple!!!

Sharpness is based on the MTF measurement. Let’s start with a practical measurement experiment to help describe what MTF is. If we look at a series of black and white stripes with varying spatial frequency and fixed contrast (same reflectance ratio between black and white, independent of the spatial frequency), we can see that the image of high-frequency stripes has a lower contrast than that for low-frequency stripes. For very high frequencies, the image eventually becomes (almost) uniform, with an intermediate level between black and white, which our eyes perceive as a shade of gray.

Function of the eye lens in the eyepiece. Image taken from: Bradbury, S. (1967) The Evolution of the Microscope, Figs. 1.4 & 1.5, pages 11, 14. Pergamon. The ...

G05F1/563 Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with ...

Did you know that approximately 10% of the American population has low vision? That is why magnification is a necessity for this population to keep their independence.  In addition, many of this population has access to an iPhone or iPad.

Sharpness is a subjective quality attribute of an image or a lens. Sharpness indicates the visually perceived quality of details of an image or details reproduced by a lens. It is associated with both resolution and contrast of reproduced details (within an image or by a lens).

Sep 11, 2023 — In the case of wtGFP, enhancements lead to an EGFP (enhanced GFP ) with a single excitation peak at 488 nm instead of the previous complex ...