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Vision Disorders
As humans, we can experience vision disturbances at any age. Some eye problems affect young children while others only come with old age. Ask questions here about near sightedness, farsightedness, glaucoma, cataracts, floaters, macular degeneration and other vision disorders.
275 Questions
What are the possible treatments for glaucoma?
Three types of treatments are available for Galucoma: 1) medication -- eye drops and pills, 2) laser procedures and 3) incisional surgery. Medications. The four main families of medications are: beta blockers (Timoptic, Betoptic), carbonic anhydrase inhibitors (Trusopt, Azopt), alpha agonists (Alphagan, Iopidine) and prostaglandin (Xalatan). The first three types of medications decrease production of fluid in the eye, while prostaglandin helps fluid leave the eye through a different pathway located at the back of the eye. Laser procedures. An argon laser may be used to perform a procedure called a trabeculoplasty. The laser is focused into the meshwork where it alters cells there to let aqueous fluid leave the eye more efficiently. It is a painless procedure, taking 10-20 minutes, in a doctor's office or outpatient facility. According to the Glaucoma Foundation, nearly 80% of patients respond well enough to the procedure to delay or avoid further surgery. Some patients can eventually discontinue glaucoma medication. However, pressure increases again in more than half of all patients within two years after laser surgery, according to the National Eye Institute. A laser is also sometimes used to make a small hole in the colored part of the eye (the iris) to allow the aqueous fluid to flow more freely within in the eye. Incisional surgery. Open, incisional surgery may be performed if medication and initial laser treatments are unsuccessful in reducing pressure within the eye. One type of surgery, a trabeculectomy, creates an opening in the wall of the eye so that aqueous humor can drain. If it performed under local anesthetic as an outpatient procedure or may require a brief hospital stay. Most patients can discontinue glaucoma medication after surgery, although 10 to 15% will require additional surgery. About one-third of trabeculectomy patients develop cataracts within five years, according to the Glaucoma Foundation. If the trabeculectomy fails, another type of surgery places a drainage tube into the eye between the cornea and iris. It exits at the junction of the cornea and sclera (the white portion of the eye). The tube drains to a plate that is sewn on the surface of the eye about halfway back. A final -- and infrequently used -- surgical procedure uses a laser or freezing treatment to destroy tissue in the eye that makes aqueous humor Surgery may save remaining vision, but it does not improve sight. Vision may actually be worse following surgery. The key to preserving vision in a glaucoma patient remains early detection. With early detection, the disease can be more easily managed without invasive procedures.
How do our eyes differentiate colours?
Your color has eyes from pigments, and genetics. Brown eyes are dominant, and blue eyes are recessive. So if you have a male with brown eyes, and a blue recessive gene, and a female with blue eyes, there's a 50/50 chance their kids will have blue eyes. If I, I have blue eyes, have kids with a boy who has blue eyes, all of our kids will have blue eyes, because between the two of us, there are no dominant brown eye genes.
yeah..dont think that answered their question...nice try though.
One thing I know for sure is that if two parents with blue eye's have kid's their kids could have blue eye's or a different color because another family member could have genes for a different eye color. Your gene's determine what color you eye's are.
What part of the eye affects vision?
There are a lot of things that affect your eyes most of which is light. light is invisible to the human eye, but can none the less have dangerous effects. The visible light, that provides us with color vision represents just a small, part of the electromagnetic spectrum. All these color form a spectrum which creates what we see and thus making it the most affective.
Why does your eye have a blind spot?
There is a spot on your retina that does not contain any rods or cones (the cells that take in light stimuli and send the information to our brain, which then interprets that information into the images you see) and hence is why you have a blindspot.
How do you determine your vision in terms of 20 X from your contact lens power?
It cannot be done with any precision.
With a near-average pupil size, an eye capable of good vision when corrected will have about 20-200 vision at -3.00 dioptres uncorrected, or 20-24 to 20-60 at -1.00 but a young person will not be nearly so badly affected with the equivalent + prescription.
Pupil size will make an enormous difference, the "pinhole-camera" effect. With a 1mm pinhole in a piece of card held near the eye, the vision can be surprisingly good, whatever the amount of missing correction.
With the contact lens correction in place, the vision will depend on the accuracy of the prescription and the optical and neurological quality of the eye. A needed -10 contact lens might give 20-20 vision, but an eye with cataract might have poor vision even if not needing any optical correction. A strong contact lens would not improve the situation but worsen it.
ANSWERS
There is no exact correlation because pupil size enters into it. The more light in the room the smaller the pupil and the better the vision for a given diopter. Only an approximation can be given. Also a plus diopter correction will affect visual acuity more than a minus diopter correction because of the way accommodation can neutralize some of the minus power. The younger the individual the greater the amount.
What is the shape of the eyeball if you are nearsighted?
Glasses for nearsighted people are convex. That is, the center of the lens is thinner than the outer edges.
Is it possible to be legally blind and have perfect vision?
Yes. It is very much possible. Vision is totally subjective. That means the person see the things is perceived by the subject only. So you can bribe and get the blindness certificate. Most of the developed world can not imagine this. But the system can be corrupt from top to bottom. Specially in the country like India. I have already written about this. Laws in India were made by British designers. They were made in such a way to facilitate to trap the innocent Indian and liberate the culprit British citizen. The subsequent Indian administrators found it convenient to continue the laws. In spite of such laws, the British people rarely misused the laws. Subsequently the Indian politicians and bureaucrats misused the laws and developed the system to do large scale corruption. So as a result the most pious and religious people turned out to be the most corrupt. The world has to pay the price for this nefarious design of then British designers. It was short term gain and long term loss to the world as a whole to have one fifth population corrupt. People call you stupid in India, if you are not corrupt. Then there can be neurotic disorder, in which the person gets blind. Here the person is not blind. But he is not able to see also. That means the sensory inputs from the eyes are strongly suppressed by the brain of the patient.
Then there can be malingers, who cheats the doctors. Here there can be competition between the person and the doctor. Usually it is not possible to cheat the expert. But it's not impossible.
Pi is the worst number.
People are always worshiping this number, even the most famous mathematicians. Tau is better than pi. It makes 2 times more sense than pi (literally). When pi is used in trigonometry, most things have to do with 2pi. Why not use tau? It makes much more sense. Tau = 2pi. Tau also adds 8 more angles to the unit circle (called the tau circle when using tau). There are more reasons why tau is better than pi. Look them up, and join the International Tau Movement.
Does reading a lot cause myopia?
If you are referring to myopia in the sense of intellectual short-sightedness, then no, reading a diverse amount of literature is one of the main cures of myopia.
If you are referring to the visual disorder of myopia, then reading excessively can help to cause the disease, especially under poor light conditions.
Is 6 9 6 18 vision considered poor?
Yes, 6/9 vision is generally considered better than average, as it indicates that a person can see at 6 meters what a person with normal vision can see at 9 meters. In contrast, 6/18 vision is considered poor, as it means the individual can only see at 6 meters what a person with normal vision can see at 18 meters. Therefore, while 6/9 vision is not poor, 6/18 vision is classified as below average and may require corrective measures.
Explain why people often become farsighted as they grow older?
Presbyopia means "age of sight." It is a gradual loss of the ability of the eye to adjust in order to see clearly objects at different distances. As the lens of the eye ages, it becomes less elastic, which results in less accommodative power.
Please look at the information given to you by the clinic. If you can't find any information there, call the number listed or call them in the morning. If you can't find any thing now, try compresses to the affected eye.
Can you have 2020 vision and be farsighted?
Yes you can have 20/20 and be farsighted. I just got back from the eye doctor and that is what I am.
I can see far away and up close (though not any closer than about 4 or 5 inches then it gets blurry) The eye doctor said that the muscles in my eyes are constantly flexing, or the equivalent of carrying around a 20 lb weight, you can do it but your muscles are going to become fatigued and sore, so I can see but my eyes suffer hence why I get headaches while reading or working on the computer. So he prescribed me a very low prescription that I only need to wear while doing things that require me to look close : )
What if your vision in one eye is nil and 20-60 in the other. Is it still safe to drive?
It should be, but you will be required to wear glasses. Many people drive just fine without depth perception... they just need to be very careful.
Why is convex lens used for myopia?
Convex lenses cause the focal point to appear behind the lens (positive convergence). In myopia, the focal point lies somewhere between the lens and the retina, it needs to converge at a point farther than it is converging, this is why a convex lens is used, to push the focal point back so it will hit the retina.
A concave lens would do the opposite for hyperopia (the focal point appears behind the retina), it will adjust the focal point to lie more anteriorly and land on the retina.
binocular
