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

3.8 out of 5 stars 19 customer reviews

Price: £3.99
As expected (93%)
93% of customers say this fits as expected.
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0
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14
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Bought them here on Amazon, used them a few times.
It takes time the eyes to adjust but afterwards it's getting better everyday.
Excellent valu for money as they are normally a lot more expensive
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Blue
In stock.
Dispatched from and sold by 4sold.
  • 4sold® glasses by 4sold
  • orginal only from 4sold® with 4sold logo
  • pin-12
  • Quick delivery from UK
  • Unisex
  • Unisex style

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Colour Name: Blue

Product details

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  • ASIN: B00J7UK612
  • Date first available at Amazon.co.uk: 24 Mar. 2014
  • Average Customer Review: 3.8 out of 5 stars  See all reviews (19 customer reviews)
  • Amazon Bestsellers Rank: 122,885 in Clothing (See Top 100 in Clothing)

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


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Customer Reviews

3.8 out of 5 stars
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Top Customer Reviews

Colour: black Verified Purchase
work really well when wearing them but i cant see how they improve your sight
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Colour: 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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Colour: 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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Colour: Blue Verified Purchase
I didn't realize that the colour of the glass it was supposed to be blue. I just bought because I thought it was transparent, like this picture. My suggestion it to change the picture to be like the real product.
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Colour: 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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Colour: 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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Colour: 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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Colour: black Verified Purchase
I'm short sighted and they do as they say, improve vision. Could probably do with thinner lenses.
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