surface anatomy of the eye
DESCRIPTION
Over the iris the transparent layer is the cornea. Surface anatomy of the eye. Pupil. Sclera. Iris. Conjunctiva. Different color of iris in human eye. Green in Asia. Amber in Asia. Blue eyes in Europe. Albino In Europe. Brown eyes in Asia, Africa, and Scandinavia. - PowerPoint PPT PresentationTRANSCRIPT
Surface anatomy of the eye
ScleraIris
Pupil
Over the iris the transparent layer is the cornea
Conjunctiva
Different color of iris in human eye
Blue eyes in Europe Green in Asia Amber in Asia
Brown eyes in Asia, Africa, and Scandinavia
Grayish eyes in Russia, Finland, North Africa
AlbinoIn Europe
IRIS PLANT
Iris is a genus of 260 species of flowering plants.It takes its name from theGreek word for a rainbow,referring to the widevariety of flower colorsfound among the many species.
Iris latifolia
About Tapetum Lucidum
The tapetum lucidum is a layer of tissue in the eye of many vertebrates animals, that lies immediately behind or sometimes within the retina.
It reflects visible light back through the retina, increasing the
light available to the photoreceptors. This improves vision in low-light conditions.
The tapetum lucidum contributes to the superior night vision of some animals. Many of these animals are nocturnal, especially carnivores that hunt their prey at night, while others are deep see animals.
Tapetum Lucidum
TapetumLucidum
RetinaTapetum
1. Tapetum lucidum reflect lights and when the eyes examined it appears as a metallic green, blue, orange gold, brown.
2. The tapetum in horse, ruminants, man and few others animals is fibrous and can not reflect light.
3. The tapetum lucidum which reflects light consists of 10 – 15 layers of flat, irregular, pentagonal cells.
Lens
Tapetum
Different eye shines due to tapatum
White eye shine in walleye fish Yellowish-green eye shine in cat and dog
Yellow eye shine in raccoons Red eye shine in opossum, rodents and birds.
Brightness of human and dog eyeMZI Khan
Yellowish-green eye shine in dog due to tapetum lucidum
Human eye can not shine because thetapetum is fibrous.
CATS EYE
Carnivores can see in night due to:(1) Wide vertical pupil which permits more amount oflight to enter in to the eye.(2) Presence of metallic greentapetum in between retina and choroids.
Vision in night
snakes "see" their prey in green night-heat vision
Color blindness
Rod cell are responsible for photosensation
Cones for the color
Vision of Shark
Sharks do not possess the same variety of photorec- eptors as humans. They have few retinal cones, and as a result, most have no color vision. They have much larger rod receptors (which pick up light), so their vision is much less acute thanours.
Color Blindness
Human eye vision (color vision okay)
Horse vision (color blindness for red and green)