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2. Indian-head test pattern - Wikipedia

   en.wikipedia.org/wiki/Indian-head_test_pattern

   The Indian-head test pattern is a test card that gained widespread adoption during the black-and-white television broadcasting era as an aid in the calibration of television equipment. It features a drawing of a Native American wearing a headdress surrounded by numerous graphic elements designed to test different aspects of broadcast display.

3. Prism correction - Wikipedia

   en.wikipedia.org/wiki/Prism_correction

   Prism dioptres. Prism correction is commonly specified in prism dioptres, a unit of angular measurement that is loosely related to the dioptre. Prism dioptres are represented by the Greek symbol delta (Δ) in superscript. A prism of power 1 Δ would produce 1 unit of displacement for an object held 100 units from the prism. [2]

4. Prism cover test - Wikipedia

   en.wikipedia.org/wiki/Prism_Cover_Test

   The prism cover test ( PCT) is an objective measurement and the gold standard in measuring strabismus, i.e. ocular misalignment, or a deviation of the eye. [1] It is used by ophthalmologists and orthoptists in order to measure the vertical and horizontal deviation and includes both manifest and latent components. [1]

5. Corrective lens - Wikipedia

   en.wikipedia.org/wiki/Corrective_lens

   Corrective lens. A corrective lens is a transmissive optical device that is worn on the eye to improve visual perception. The most common use is to treat refractive errors: myopia, hypermetropia, astigmatism, and presbyopia. Glasses or "spectacles" are worn on the face a short distance in front of the eye.

6. Olympic-Obsessed Golden Retriever Can't Take His Eyes Off the ...

   www.aol.com/olympic-obsessed-golden-retriever...

   Despite their duller eyesight, dogs can be visually attracted to the content playing on a television screen. While we have three types of color-processing retinas in our eyes, dogs only have two ...

7. List of HD channels in the United Kingdom - Wikipedia

   en.wikipedia.org/wiki/List_of_HD_channels_in_the...

   This is a list of current high definitionchannels that are available in the United Kingdom, together with those coming in the future, and those that have ceased broadcasting. All HD channels in the UK broadcast at 1080i, apart from Sky Sports Main Event UHD channel and the BT Sport Ultimate 4K. [1]HD channels can dynamically switch between ...

8. List of United States pay television channels - Wikipedia

   en.wikipedia.org/wiki/List_of_United_States_pay...

   The following is a list of pay television networks or channels broadcasting or receivable in the United States, organized by broadcast area and genre.. Some television providers use one or more channel slots for east/west feeds, high definition services, secondary audio programming and access to video on demand.

9. Prism (optics) - Wikipedia

   en.wikipedia.org/wiki/Prism_(optics)

   Prism (optics) A familiar dispersive prism. An optical prism is a transparent optical element with flat, polished surfaces that are designed to refract light. At least one surface must be angled — elements with two parallel surfaces are not prisms. The most familiar type of optical prism is the triangular prism, which has a triangular base ...