Description:
Human vision, visual correction, and visual science.
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Focal length, dioptre, magnification
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I would like to ask the specialists a question. I have a magnifying glass. I measure the focal length by seeing how far away the lens is when it makes a focussed image of the sun on the ground. If that value is, for example, 12 cm then: (a) how do I calculate the dioptre strength of the lens? (b) How do I calculate the magnification?... more »
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Animal Model of Macular Degeneration
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AMD-like lesions in the rat retina: A latent consequence of perinatal hemorrhage Pow, D. V. and Diaz, C. M. (2008) Investigative Ophthalmology & Visual Science, 49 7: 2790-2798. Abstract PURPOSE. Hemorrhaging is a commonplace event in the human retina around the time of birth. This study was conducted to examine the potential long-... more »
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Want another reason why you shouldn't spend too much time at the trough? Because consistently eating too much food over a period of just a few weeks can screw up your brain, taking away your ability to control your appetite. Read More [link]... more »
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Blinding Toxic Iron
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Iron prochelator BSIH protects retinal pigment epithelial cells against cell death induced by hydrogen peroxide. J Inorg Biochem. 2008 Aug 24. Charkoudian LK, Dentchev T, Lukinova N, Wolkow N, Dunaief JL, Franz KJ. Department of Chemistry, Duke University, Durham, NC 27708-0346, United States. Dysregulation of localized iron homeostasis is implicated in several... more »
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Can someone help me through the BS?
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My prescription is +1.75 add +2.25, progressive bifocals. The pair I bought 4 years ago were extremely comfortable, but the lenses got progressively smearier until they just couldn't be cleaned. Two years ago I bought two pair (everyday and safety) without the antireflection coating that apparently failed in the older pair. I didn't... more »
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