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The Worth Four Light Test, also known as the Worth's four dot test or W4LT, is a clinical test mainly used for assessing a patient's degree of binocular vision and binocular single vision. Binocular vision involves an image being projected by each eye simultaneously into an area in space and being fused into a single image.
Unlike we humans, cats don't have cones that are sensitive to red wavelengths — that means that they lack the light-sensitive pigments at the back of their eye that enable them to see red.
In very bright light, the slit-like pupil closes very narrowly over the eye, reducing the amount of light on the sensitive retina, and improving depth of field. Big cats have pupils that contract to a round point. Variation in color of cats' eyes in flash photographs is largely due to the reflection of the flash by the tapetum. A closeup of a ...
Leukocoria may appear also in low indirect light, similar to eyeshine. Leukocoria can be detected by a routine eye exam (see Ophthalmoscopy). For screening purposes, the red reflex test is used. In this test, when a light is shone briefly through the pupil, an orange red reflection is normal. A white reflection is leukocoria.
Because most of the preferred "domestic traits" are neotenous, or juvenile traits that persist in the adult, kneading may be a relic juvenile behavior retained in adult domestic cats. [15] It may also stimulate the cat and make it feel good, in the same manner as a human stretching. Kneading is often a precursor to sleeping.
Feral cats are the offspring and descendants of stray or abandoned house pets, which is why it is so important to get your cat spayed or neutered, especially if you allow them outside.
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The red reflex (also called the fundal reflex) refers to the reddish-orange reflection of light from the back of the eye, or fundus, observed when using an ophthalmoscope or retinoscope. The red reflex may be absent or poorly visible in people with dark eyes, and may even appear yellow in Asians or green/blue in Africans.