how do cresty's eyes work, proving dangers of extremley bright light
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how do cresty's eyes work, proving dangers of extremley bright light
by ginnerone Sun Jun 20, 2010 1:45 am
How geckos eyes work
Certain gecko’s can see colour in dim light. That means these gecko’s eyes are about 350 times more sensitive than human eyes, which see only black and white in the same conditions. Scientists studying gecko’s eyes found distinct concentric zones, each with a different refractive power. Geckos also have a much higher density of oversized cone cells in their retinas that are responsible for detecting specific light wavelengths. In their studies the researchers found that together, these zones and cones form a multifocal optical system. Furthermore, the refractive powers of their lens array is of the same magnitude as needed to focus light of the wavelength range to which gecko photoreceptors are most sensitive.
Thus, the various parts of this gecko’s eyes are finely tuned to work together, allowing the animal to sharply focus on at least two different depth fields at the same time. In addition to seeing color in the dark, the geckos have built-in correctional abilities for blurred images caused by longitudinal chromatic aberration, or the failure to focus all colors to the same point. The authors of the study asserted that at some point in evolution the geckos turned to a nocturnal lifestyle. In response to the demands of nocturnal vision without rods, the cones of nocturnal geckos have become much larger and more light sensitive than those of their diurnal relatives. It is now thought that with this kind of vision gecko's can see as clearly at night as what we can during the day, To this end it has been found that prolonged exposure to bright light without the option for the animal to hide can damage and in some cases blind your gecko temporarily and can cause permanant sight damage and permanent blindness.
Certain gecko’s can see colour in dim light. That means these gecko’s eyes are about 350 times more sensitive than human eyes, which see only black and white in the same conditions. Scientists studying gecko’s eyes found distinct concentric zones, each with a different refractive power. Geckos also have a much higher density of oversized cone cells in their retinas that are responsible for detecting specific light wavelengths. In their studies the researchers found that together, these zones and cones form a multifocal optical system. Furthermore, the refractive powers of their lens array is of the same magnitude as needed to focus light of the wavelength range to which gecko photoreceptors are most sensitive.
Thus, the various parts of this gecko’s eyes are finely tuned to work together, allowing the animal to sharply focus on at least two different depth fields at the same time. In addition to seeing color in the dark, the geckos have built-in correctional abilities for blurred images caused by longitudinal chromatic aberration, or the failure to focus all colors to the same point. The authors of the study asserted that at some point in evolution the geckos turned to a nocturnal lifestyle. In response to the demands of nocturnal vision without rods, the cones of nocturnal geckos have become much larger and more light sensitive than those of their diurnal relatives. It is now thought that with this kind of vision gecko's can see as clearly at night as what we can during the day, To this end it has been found that prolonged exposure to bright light without the option for the animal to hide can damage and in some cases blind your gecko temporarily and can cause permanant sight damage and permanent blindness.
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Re: how do cresty's eyes work, proving dangers of extremley bright light
by xvickyx Sun Jun 20, 2010 12:32 pm
Interesting stuff 
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