What is the correct order in which light enters the eye..? 1. Cornea 2. Iris. Retina?
362649
thats exactly the order sweetheart. its cornea iris retina
1027815
The light receptors in your eye, can only interpret light and colors coming into your eye.  When you press on your eye, you are causing pressure in the eyeball.  This also is transmitted to the light receptors, but since they cannot interpret pressure, they send messages about light and colors.
310583
It's just a light thing.  I've studied this for art more than for science...um, red light is the shortest wavelenth, so it's the first to be filtered out by distance.  If they're far enough away, only the blues and purple wavelengths make it to your eyes.
802403
You mean green colour of your eyes? Because its sexy.\n\nOr you mean green colour of objects you see? Well, I don't think it is specifically green, that is good for eyesight. Blue colour may be worse, since in the foveola centralis ("center of your exesight") there are red and green cones, blue cones are outside (RBG - just like colour tv, remember?).
966162
The flash is the problem. The eye's retina contains a crisscross of red blood vessels. Sometimes, when the light from a camera flash reflects off the retina it bounces back to the camera lens carrying a red tint from the blood vessels and from a brownish pigment in a few layers of the retina.
582880
The cornea (thats the very front  part of the eye which is clear- its clear because of no blood vessels)..it derives its nutrition from a fluid behind it called the aqueous humour...
424046
Basik Lasik: Tips on Lasik Eye Surgery\nProduced in cooperation with the American Academy of Ophthalmology.\nIf you're tired of wearing glasses or contact lenses, you may be considering Lasik eye surgery — one of the newest procedures to correct vision problems. Before you sign up for the surgery, get a clear picture of what you can expect. \nThe Facts\n•Lasik is surgery to a very delicate part of the eye. \n•Hundreds of thousands of people have had Lasik, most very successfully. \n•As with any surgery, there are risks and possible complications. \n•Lasik may not give you perfect vision. The American Academy of Ophthalmology (AAO) reports that seven out of 10 patients achieve 20/20 vision, but 20/20 does not always mean perfect vision. \n•If you have Lasik to correct your distance vision, you'll still need reading glasses around age 45. \n•Lasik surgery is too new to know if there are any long-term ill effects beyond five years after surgery. \n•Lasik surgery cannot be reversed. \n•Most insurance does not cover the surgery. \n•You may need additional surgery — called "enhancements" — to get the best possible vision after Lasik. \nUnderstanding Your Eyes \nTo see clearly, the cornea and the lens must bend — or refract — light rays so they focus on the retina — a layer of light-sensing cells that line the back of the eye. The retina converts the light rays into impulses that are sent to the brain, where they are recognized as images. If the light rays don't focus on the retina, the image you see is blurry. This is called a refractive error. Glasses, contacts and refractive surgery attempt to reduce these errors by making light rays focus on the retina. \nRefractive errors are caused by an imperfectly shaped eyeball, cornea or lens, and are of three basic types: \n•myopia — nearsightedness; only nearby objects are clear. \n•hyperopia — farsightedness; only objects far away are clear. \n•astigmatism — images are blurred at a distance and near. \nThere's also presbyopia — "aging eye." The condition usually occurs between ages 40 and 50, and can be corrected with bifocals or reading glasses. \nAre You a Good Candidate for Lasik? \nLasik is not for everyone. \n•You should be at least 18 years old (21 for some lasers), since the vision of people younger than 18 usually continues to change. \n•You should not be pregnant or nursing as these conditions might change the measured refraction of the eye. \n•You should not be taking certain prescription drugs, such as Accutane or oral prednisone. \n•Your eyes must be healthy and your prescription stable. If you're myopic, you should postpone Lasik until your refraction has stabilized, as myopia may continue to increase in some patients until their mid- to late 20s. \n•You should be in good general health. Lasik may not be recommended for patients with diabetes, rheumatoid arthritis, lupus, glaucoma, herpes infections of the eye, or cataracts. You should discuss this with your surgeon. \n•Weigh the risks and rewards. If you're happy wearing contacts or glasses, you may want to forego the surgery. \n•Understand your expectations from the surgery. Are they realistic? \n•Ask your doctor if you're a candidate for monovision — correcting one eye for distance vision and the other eye for near vision. Lasik cannot correct presbyopia so that one eye can see at both distance and near. However, Lasik can be used to correct one eye for distance and the other for near. If you can adjust to this correction, it may eliminate or reduce your need for reading glasses. In some instances, surgery on only one eye is required. If your doctor thinks you're a candidate, ask about the pros and cons. \nFinding a Surgeon \nOnly ophthalmologists (Eye MDs) are permitted to perform Lasik. Ask your Eye MD or optometrist for a referral to an Eye MD who performs Lasik. The American Academy of Ophthalmology websit
546500
LASIK surgery, where a thin layer of the cornea is sliced... so that the image that you see no longer falls short of the retina, but is directed to it due to the different angle that the light is refracted.
1134599
It's light bouncing off the back of the inside of the eye. The camera catches it before the iris has time to contract in response to the higher light level. I've seen the red eye effect firsthand, in real time. A cousins baby was staring up at a streetlamp, quite creepy. Animals have a reflective membrane, the 'tapetum lupidia' behind their photoreceptor cells that bounces light back through them, the photo receptors that is, it gives them better night vision by giving the light two chances to hit. We don't have one because our color vision comes with the cost of poor sensitivity in low light.
80133
I'm so not good at science, but isn't the pupil a hole? And the iris is a muscle surrounding it that contracts and expands upon exposure to light. If indeed it is a hole......perhaps this is why it is dark. *shrugs*
1073050
the most important diffrences between light colored eyes and dark eyes are the pigmentations of the iris and also the diameter of stroma layer of cronea. having thiner stroma layer and less pigmentations in blue eyes may result in higher injury of retina from light(especially UV).
232489
its a clear protective coating over the pupil and the iris. the pupil is actually an empty space. the iris is a pigmented ring of muscle which when it contracts lets less light into the eye also known as pupillary constriction. when the iris relaxes the pupil opens up causing pupillary dialation. the more constricted the pupil the sharper your vision. but at night you need to let the maximum amount of light into the eye so the pupil dialates. the large opening causes less sharp visual acuity. the lens of the eye focuses light on to the retina behind it which is filled with rods and cones which are receptors. all the nerve cells and blood vessels converge into the optic disc and then into the optic nerve behind the eye. the optic nerves of both eyes intersect and combine signals which are sent to the occipital lobe of the brain in the back of your head. so actually you see with your brain
902758
The light of the flash occurs too fast for the iris of the eye to close the pupil. The flash light is focused by the lens of the eye onto the blood-rich retina at the back of the eye and the image of the illuminated retina is again focused by the lens of the eye back to the camera resulting in a red appearance of the eye on the photo. (This principle is used in the ophthalmoscope, a device designed to examine the retina.)\n\nThe effect is generally more pronounced in people with grey or blue eyes and in children. This is because pale irises have less melanin in them and so allow more light to pass through to the retina. Children, despite superficial appearances, do not have larger pupils but their pupils are more reactive to light and are able to open to the fullest extent in low light conditions. Many adults have lost the ability to fully open their pupils except through the use of drugs.\n\nIn many species the tapetum lucidum, a light-reflecting layer behind the retina that improves night vision, intensifies this effect. This leads to variations in the colour of the reflected light from species to species. Cats, for example, display blue, yellow, pink, or green eyes in flash photographs.\n\n\nPreventing red-eye\nThe red-eye effect can be prevented in a number of ways.\n\nUsing bounce flash in which the flash head is aimed at a nearby pale coloured surface such as a ceiling or wall or at a specialist photographic reflector. This both changes the direction of the flash and ensures that only diffused flash light enters the eye. \nPlacing the flash away from the camera's optical axis ensures that the light from the flash hits the eye at an oblique angle. The light enters the eye in a direction away from the optical axis of the camera and is refocused by the eye lens back along the same axis. Because of this the retina will not be visible to the camera and the eyes will appear natural. \nTaking pictures without flash by increasing the ambient lighting, opening the lens aperture, using a faster film or detector, or reducing the shutter speed. \nUsing ambient light and then \ndigitally post-processing the image to increase its brightness. \nPushing the film development to increase the apparent film speed \nUtilising red-eye reduction capabilities that are built in to many modern cameras. These precede the flash with a series of short low power flashes triggering the iris to contract. \nHaving the subject not look straight at the camera, instead look at the shoulder of the photographer. \nIncrease the lighting in the room so that the subject's pupils are more closed. \nSome computer digital image editors have the ability to lessen the red eye by adding a hint of blue to it.
9480
The light was not reflected.  Think about this:  if you look into someone's eye (through their pupil), can you see the back of their eye?  No.  The light is actually absorbed by special cells in the retina called photoreceptors (rods and cones).  These cells start the transmission of light information to the brain.
1170811
If you are meaning the color of a person's eye, it is the iris that has the color that others see. If you mean someone having two different colors of eye, that is called heterochromia.
745396
Hi there, i don't know how old are you so can't decide on how technical i can be in answering this question. Any way i shall try to be simple.\nThe coloured (black, blue, green or whatever) part of the eye is called the IRIS (not pupil).  It is a shutter that guards the tiny hole in its center(this hole is actually called pupil). \nThe iris prevents too much of light from entering the eyes.It also helps animals and man to see better in darkness. The blackish pigment that colours your iris is MELANIN and its the same colouring agent that gives tan to your skin. Some people have deep melanin pigmentation on their iris and hence they have blackish iris. in some people, the amount of this pigment is a bit low, hence, their eyes seem brown. When the amount of colour is much lower, the eyes appear more bluish yellowish or greenish.\nIts actually the total absence of melanin that makes some eyes look blue or green. \nok, then thats all....\nGood bye!
166890
because it passes thru our cornea and hits our retina