Lovely Cats Part. Cats Have Excellent Night Vision And Can See At Only One-Sixth The Light Level Required For Human Vision.[65]:43 This Is Partly The Result Of Cat Eyes Having A Tapetum Lucidum, Which Reflects Any Light That Passes Through The Retina Back Into The Eye, Thereby Increasing The Eye& X27;S Sensitivity To Dim Light.[97] Another Adaptation To Dim Light Is The Large Pupils Of Cats& X27; Eyes. Unlike Some Big Cats, Such As Tigers, Domestic Cats Have Slit Pupils. These Slit Pupils Can Focus Bright Light Without Chromatic Aberration, And Are Needed Since The Domestic Cat& X27;S Pupils Are Much Larger, Relative To Their Eyes, Than The Pupils Of The Big Cats. At Low Light Levels A Cat& X27;S Pupils Will Expand To Cover Most Of The Exposed Surface Of Its Eyes.[99] However, Domestic Cats Have Rather Poor Color Vision And & X28;Like Most Nonprimate Mammals& X29; Have Only Two Types Of Cones, Optimized For Sensitivity To Blue And Yellowish Green; They Have Limited Ability To Distinguish Between Red And Green. From Wikipedia

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