You may have an infection.     A positive finding of the enzyme leukocyte esterase in urinalysis  indicates the presence of white blood cells in the urine. This  n â¦ ormally suggests inflammation of some sort, often from a urinary  tract infection.
The nictitating membrane of a masked lapwing as it closes. The nictitating membrane (from Latin nictare, to blink) is a transparent or translucent third eyelid present in some animals that can be drawn across the eye for protection and to moisten it while maintaining vision.
Many animals, such as diving hawks or polar bears, use nictitating membranes to protect their eyes from water or snow blindness, but few are as spectacularly patterned as that of the red-eyed tree frog (Agalychnis callidryas).any animals, such as diving hawks or polar bears, use nictitating membranes to protect their eyes from water or snow blindness, but few are as spectacularly patterned as that of the red-eyed tree frog (Agalychnis callidryas).