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Black Eyesight Improvement Vision Care Exercise Eyewear Pinhole Glasses brand 4sold


Black
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  • 4sold logo brand 4sold
  • Suitable for both adult or children who has the problem of myopia, hyperopia, and astigmatism
  • Theory is very simple: when the eyes can only look through the small holes, they naturally change focus to a relaxing standard, so that the eyeballs are relieved from the previous nervous focus
  • Wearing for 15 minutes one day will help to improve your eyesight within 2-4 weeks
  • Dimensions: arm length - approx.12cm/4.7"; bridge length - approx.1.6cm/0.6"; overall length (without arms) - approx.16.2cm/6.4"

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Colour Name: Black

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  • ASIN: B00J7UK612
  • Date first available at Amazon.co.uk: 24 Mar 2014
  • Average Customer Review: 3.2 out of 5 stars  See all reviews (5 customer reviews)
  • Amazon Bestsellers Rank: 23,077 in Clothing (See Top 100 in Clothing)
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Product Description

Pinhole glasses, also known as stenopeic glasses, are eyeglasses with a series of pinhole-sized perforations filling an opaque sheet of plastic in place of each lens. Similar to the workings of a pinhole camera, each perforation allows only a very narrow beam of light to enter the eye which reduces the size of the circle of confusion on the retina and increases depth of field. In eyes with refractive error, the result is claimed to be a clearer image. However, a second effect may appear at the common bridge between each two adjacent holes, whereby two different rays of light coming from the same object (but each passing through a different hole) are diffracted back toward the eye and onto different places on the retina. This leads to double vision (objects having doubled edges) around the rim of each hole the eye is not focussing on, which can make the overall image disturbing and tiring to look at for prolonged periods of time. Unlike conventional prescription glasses, pinhole glasses produce an image without the pincushion effect around the edges (which makes straight lines appear curved). While pinhole glasses are claimed to be useful for people who are both near- and far-sighted, they are not recommended for people with over 6 diopters of myopia. Additionally, pinhole glasses reduce brightness and peripheral vision, and thus should not be used for driving or when operating machinery

Customer Reviews

3.2 out of 5 stars
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Most Helpful Customer Reviews

3 of 3 people found the following review helpful By Farouk H. G. Smith on 29 April 2013
Colour Name: Black Verified Purchase
Bought them here on Amazon, used them a few times. Noticed that peripheral vision is reduced, so more head turning required. Other than that, I do notice a positive difference when trying to read information off the television screen, which normally i can only do with my glasses on. Words become legible. I am near-sighted, so can't say how well they work for far-sighted person.
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2 of 2 people found the following review helpful By filip costa on 8 Jun 2013
Colour Name: Black Verified Purchase
If you get tired and have problem focusing after a few hours looking at the screen this is a simple and very effective solution. I used to suffer from terrible headaches and eye problems, now I am sorted. I also use for reading and as sun glasses. They need no cleaning and they never get smeared. Initially they need a little time to get used to. But now I could not do without.
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1 of 1 people found the following review helpful By womble gizmo on 24 Jun 2013
Colour Name: Black Verified Purchase
When I remember to put them on lol they do help my eyes don't strain as much anymore when I watch telly
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3 of 4 people found the following review helpful By nessy on 6 Dec 2012
Colour Name: Black Verified Purchase
This does not work. It is so dark that you are straining your eyes to see out of it and struggling to read each word.
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2 of 3 people found the following review helpful By thisisjoy on 13 Feb 2013
Colour Name: Black Verified Purchase
specs didn't improve eyesight...just throwed out coloured refracted light in line of view...would not recommend this make, although as a long-time user would highly recommend pinholes...try before you buy!
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