https://www.khanacademy.org/science/telangana-class-10-physical-sciencein/x1ac9c643dc8dffee:in-in-the-human-eye-and-colourful-world/x1ac9c643dc8dffee:defects-of-vision-and-correction/v/myopia-hypermetropia-class-12-india-physics-khan-academy 2020-09-09T12:23:24Z Myopia & Hypermetropia Let's explore the common defects in the eye, myopia (shortsightedness) and hypermetropia (farsightedness), using ray diagrams. Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/U8y0DUElQc-l06Da__vArDvNFsXvTFEHHn4j6q3HaJrMDxhkx6Fki1DFWtQr2aNCXgQ5uu1_mEZJyYig1XCw-UE Myopia & Hypermetropia Let's explore the common defects in the eye, myopia (shortsightedness) and hypermetropia (farsightedness), using ray diagrams. https://cdn.kastatic.org/ka-youtube-converted/dnlS940wez8.mp4/dnlS940wez8.mp4 575 Defects of vision and correction https://www.khanacademy.org/science/telangana-class-10-physical-sciencein/x1ac9c643dc8dffee:in-in-the-human-eye-and-colourful-world/x1ac9c643dc8dffee:defects-of-vision-and-correction/v/presbyopia 2020-10-01T13:55:55Z Presbyopia Let's explore what are the symptoms and causes of Presbyopia. We will also see how bifocals correct them.  Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/2aAPjT9KFKag2TlI0S0rq5sabgqPIUrujYXGOYCWzwx_CcYEKUoz7XApnYmCKWC2k-4ZQMmD_SXsys_JpPvPrR8F Presbyopia Let's explore what are the symptoms and causes of Presbyopia. We will also see how bifocals correct them.  https://cdn.kastatic.org/ka-youtube-converted/TmejI54N97E.mp4/TmejI54N97E.mp4 363 Defects of vision and correction https://www.khanacademy.org/science/telangana-class-10-physical-sciencein/x1ac9c643dc8dffee:in-in-the-human-eye-and-colourful-world/x1ac9c643dc8dffee:defects-of-vision-and-correction/e/defects-of-vision 2026-04-07T23:17:37.123726494Z Defects of vision - characteristics and symptoms Let's understand the nature of the common defects of human vision - myopia, hypermetropia, and presbyopia. Satrajit exercise https://www.khanacademy.org/science/telangana-class-10-physical-sciencein/x1ac9c643dc8dffee:in-in-the-human-eye-and-colourful-world/x1ac9c643dc8dffee:defects-of-vision-and-correction/e/defects-of-vision---causes-and-corrections 2021-04-29T07:55:47Z Defects of vision - causes and corrections Let's practice problems to understand the causes of the common defects of human vision (myopia, hypermetropia, and presbyopia) and how to correct them with external lenses. Satrajit exercise https://www.khanacademy.org/science/telangana-class-10-physical-sciencein/x1ac9c643dc8dffee:in-in-the-human-eye-and-colourful-world/x1ac9c643dc8dffee:defects-of-vision-and-correction/v/solved-example-myopia 2020-09-09T12:23:23Z Solved example: myopia Let's help our friend, Suresh, to pick the right lens for his glasses. Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/IbveCZ8IA0WjWx2wp0zZtoSUo8SotzIQln9r_uMlwCbUWlaZXFeqkVihBR0qDL9IvZK2UeomvSGWCT2pt4Omi0yBqg Solved example: myopia Let's help our friend, Suresh, to pick the right lens for his glasses. https://cdn.kastatic.org/ka-youtube-converted/PKpuibVjQJ4.mp4/PKpuibVjQJ4.mp4 459 Defects of vision and correction https://www.khanacademy.org/science/telangana-class-10-physical-sciencein/x1ac9c643dc8dffee:in-in-the-human-eye-and-colourful-world/x1ac9c643dc8dffee:defects-of-vision-and-correction/v/solved-example-hypermetropia 2020-09-09T12:23:20Z Solved example: hypermetropia Let's help our friend, Veena, to select the right lens for her eyes.  Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/rtqxBwqNHQkhk65cxSpLUvPpY1V5fEsOA_EDLCooZ-FtiDe70qptE4Vx8xkQMn2IIBaRD4wx4K4KtUYSd7Q7kCXwnA Solved example: hypermetropia Let's help our friend, Veena, to select the right lens for her eyes.  https://cdn.kastatic.org/ka-youtube-converted/NcdS7JNdGKY.mp4/NcdS7JNdGKY.mp4 437 Defects of vision and correction https://www.khanacademy.org/science/telangana-class-10-physical-sciencein/x1ac9c643dc8dffee:in-in-the-human-eye-and-colourful-world/x1ac9c643dc8dffee:defects-of-vision-and-correction/v/power-of-lens-up 2023-11-30T06:20:11.15616023Z Power of lens Let's explore how we define optical power. We will also solve a few quick numerical to see their power. Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Power of lens Let's explore how we define optical power. We will also solve a few quick numerical to see their power. https://cdn.kastatic.org/ka-youtube-converted/bchrqyLb6TY.mp4/bchrqyLb6TY.mp4 404 Defects of vision and correction https://www.khanacademy.org/science/up-class-12-physics/x0958a876c1afdc76:ray-optics-and-optical-instruments/x0958a876c1afdc76:refraction-at-sphetical-surfaces-and-by-lenses/e/power-of-lens-in 2026-04-07T23:55:07.30621384Z Power of lens Let's solve some questions! vibhor exercise