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The upper half of the eye is adapted for vision in air, the lower half for vision in water. [35] The lens of the eye changes in thickness top to bottom to account for the difference in the refractive indices of air versus water. These fish spend most of their time at the surface of the water.
Underwater vision is the ability to see objects underwater, and this is significantly affected by several factors. Underwater, objects are less visible because of lower levels of natural illumination caused by rapid attenuation of light with distance passed through the water. They are also blurred by scattering of light between the object and ...
One orange is 86% water, making it a hydrating fruit. Plus, potassium is one of the electrolytes we lose when we sweat, so eating an orange can help replace fluids after a tough workout.
Fish eyes are similar to those of terrestrial vertebrates like birds and mammals, but have a more spherical lens. Their retinas generally have both rod cells and cone cells (for scotopic and photopic vision), and most species have colour vision. Some fish can see ultraviolet and some can see polarized light.
The four pigments in a bird's cone cells (in this example, estrildid finches) extend the range of color vision into the ultraviolet. [1]Tetrachromacy (from Greek tetra, meaning "four" and chroma, meaning "color") is the condition of possessing four independent channels for conveying color information, or possessing four types of cone cell in the eye.
Impaired visuospatial skills can result in, for example, poor driving ability because distances are not judged correctly or difficulty navigating in space such as bumping into things. [ 1 ] Visuospatial processing refers to the "ability to perceive, analyze, synthesize, manipulate and transform visual patterns and images". [ 2 ]
For many people, coffee is the drink of choice first thing in the morning. The beverage made from what adults think of as magical wake-up beans gives the boost of energy many need to get out of bed.
Early mammal ultraviolet vision, or ultraviolet sensitivity, included sensitivity in the wavelength ranges between 350 nm and 430 nm . [8] These wavelengths are shorter than visible light but longer than X-rays. In some rare cases, some modern day humans can see within the UV spectrum at wavelengths close to 310 nm . [9]