Imagine that the surface of a lens is formed of huge tiny small strips arranged from center to periphery of the lens. at the center the strip on one side if the lens is parallel to that on the opposite side, next strip as we go toward periphery from an angle with each other and act as part of an imaginary prism. the more we go toward the periphery the more the surfaces are incriminated and represent small part of prisms , the inclination between the two surfaces increases as we go toward the periphery thus the power of the imaginary prisms increases. check Fig 5 at the following link : www.researchgate.net/publication/233416338_Colour_Spectral_Counterpoints_-_Case_Study_on_Aestetic_Judgement_in_the_Experimental_Sciences/figures?lo=1 and also first figure at : www.physicsclassroom.com/class/refrn/Lesson-5/The-Anatomy-of-a-Lens and this one sterlingpixels.com/demo_files/phy/Convex_Lens/E-Pub/5.png
prismatic effect is zero at the optical center of a lens, as the line of sight moves away from the optical center a prismatic effect will appear. The longer the distance of movement toward the periphery of the lens, the higher the prismatic effect and also the stronger the power of the lens the more is the prismatic effect. So to limit the prismatic effect, a person should keep looking as much as possible through the optical central area of the lens.
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شكرا دكتور على المعلومات القيمة 🙏🏻🌺
Welcome
رووعة واصلو ا جزاكم الله خيرا
الحمد لله شكرا
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Thank you professor, it was very helpful.
welcome
Thank you soo much sir....beautifully explained
welcome
Great. Need more video s with more details. We need also spherical power and astigmatic power
What do you have in mind by " spherical power and astigmatic power" ?
Sir why does the prism power increase progressively as we move from centre to periphery
Imagine that the surface of a lens is formed of huge tiny small strips arranged from center to periphery of the lens. at the center the strip on one side if the lens is parallel to that on the opposite side, next strip as we go toward periphery from an angle with each other and act as part of an imaginary prism. the more we go toward the periphery the more the surfaces are incriminated and represent small part of prisms , the inclination between the two surfaces increases as we go toward the periphery thus the power of the imaginary prisms increases. check Fig 5 at the following link : www.researchgate.net/publication/233416338_Colour_Spectral_Counterpoints_-_Case_Study_on_Aestetic_Judgement_in_the_Experimental_Sciences/figures?lo=1 and also first figure at :
www.physicsclassroom.com/class/refrn/Lesson-5/The-Anatomy-of-a-Lens
and this one
sterlingpixels.com/demo_files/phy/Convex_Lens/E-Pub/5.png
How can you eliminate prismatice effect
prismatic effect is zero at the optical center of a lens, as the line of sight moves away from the optical center a prismatic effect will appear. The longer the distance of movement toward the periphery of the lens, the higher the prismatic effect and also the stronger the power of the lens the more is the prismatic effect. So to limit the prismatic effect, a person should keep looking as much as possible through the optical central area of the lens.
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