Search results
Results from the WOW.Com Content Network
Prentice's rule is a formula to calculate the amount of prism correction in a lens based on decentration and lens power. It can be used for prescribing, tolerance control, or determining unprescribed prism in eyeglasses.
Learn about the different types of optical prisms, such as dispersive, reflective, beam-splitting and polarizing prisms, and how they refract, reflect or split light. Find out how prisms are made of transparent materials like glass, acrylic or fluorite, and how they can create spectra, images or polarizations.
A progressive lens is a corrective lens used in eyeglasses to correct presbyopia and other disorders of accommodation. It has a gradient of increasing lens power from top to bottom, and can provide clear vision at different distances. Learn about its history, design, advantages, disadvantages and adaptation.
Learn about glasses, also known as eyeglasses and spectacles, which are vision eyewear with clear or tinted lenses mounted in a frame. Find out about corrective, safety, sunglasses and other types of glasses, as well as their history and evolution.
Learn how to interpret and write an eyeglass prescription that includes sphere, cylinder and axis components. Sphere and cylinder specify the power of the lenses, and axis defines the orientation of the cylinder relative to horizontal and vertical.
A lens is a device that focuses or disperses light by refraction. Learn about the origin, classification and applications of lenses in various fields of optics, such as telescopes, microscopes, spectacles and lighthouses.
A prism cover test is a method to measure strabismus, or eye misalignment, by using prism bars and an occluder. It involves performing an alternate cover test with different prism strengths until the deviation is neutralised.
Geometry Dash is a game series developed by Robert Topala, where players control an icon and avoid obstacles to music. Geometry Dash Lite is a free version with ads and restrictions, while Geometry Dash 2.2 is the latest update with new features.