Friday, April 19, 2024

What -8 Vision Looks Like

What Is 20/80 Vision

Eye Floaters and Flashes, Animation.

20/80 vision means that a person sees best at 80 feet what others see at 20 feet. A person with this range of eyesight will typically see at a distance that is about fifty percent farther away than a person with a perfect vision which would be 20/20. This might feel strange for you if youre used to seeing up close and personal!

What The Sight Simulator Can Do

You can use the Sight Simulator to describe your own vision loss for your friends and family, or use it to experience for yourself what it means to live with low vision. When you input a street address, the Sight Simulator provides a Google Street View image that you can modify to simulate moderate to severe cataracts, glaucoma, or retinopathy.

Can 20/80 Vision Be Caused By Something Other Than Age

Yes, it can. Cataracts and macular degeneration are the most common causes of low vision and can cause 20/80 vision but there are many other possible causes such as trauma to the eyes, optic nerve lesions, tumors, and more. If you notice a significant vision change its important to see an ophthalmologist or optometrist right away so they can determine the cause and proper treatment.

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Cvi: The Leading Cause Of Blindness In Children

Cortical/cerebral visual impairment is the leading cause of blindness in children today.

What many kids with CVI see :

What most people see:

Often, people associate blindness with ocular or eye impairment. However, CVI is neurological. For kids with CVI, the eyes connection to and in the brain doesnt work correctly. There isnt a cure for CVI, but a childs ability to use his or her vision may improve with the right assessment and educational programming.

This is why Perkins is hard at work designing new ways to teach kids who have CVI. And, were dedicated to supporting their parents, educating teachers, and collaborating with experts to reach more kids with CVI where they are today.

To help us reach these families and to help them reach each other, we created CVI Now, a website and Facebook Group to help families understand CVI, learn how to help their children every day, and find other families who share their experience.

What learning with CVI looks like

How Do You Treat Flashes And Floaters


Flashes normally settle down after a few months without treatment. Floaters may be long lasting, but you tend to ignore them after a while. There is usually no treatment required for these conditions.

Watch our video to find out more about flashes and floaters:

Watch our video to find out what its like to have floaters:

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How Can I Tell If I Have 20/80 Eyesight

You may be wondering how you can know for certain whether or not you have 20/80 eyesight. You may need to visit an optometrist or ophthalmologist in order to get your eyes tested. The doctor will be able to tell you if your vision is 20/20, 20/30, 20/50, or another number on the scale of 20/xx based on a chart that measures how well you see.Ways that people with 20/80 vision might be able to overcome the disadvantages

One way to overcome any disadvantages of your condition is to wear glasses or contacts. Glasses and contacts can help you see better by providing optical correction for your vision. Another option, if the doctor says its possible, would be to get surgery to correct your eyesight. Bifocals might also help, but only if theyre prescribed for people with a refractive error that gives 20/80 vision specifically. If it is disease-related it wont help entirely. The bifocal glasses can be used as a low-vision aid and will allow you to see well up close and across the room without having to switch between corrective lenses.

What Does Vision Look Like With Macular Degeneration

Our eyes are one of the most frequently used organs of our body, and as we age, their capacities begin to dim. It happens because the structures within the eye slowly begin to deteriorate with age.

One of the prime structures that play a vital role in vision development is the retina, which lines the back of the eye. It is responsible for converting visual stimuli into meaningful images. It is essential for central vision, color vision, and visual acuity seeing the finer details of objects with vivid clarity.

Sometimes, as people approach age 55 and above, the cells of the retina begin breaking down which leads to the onset of Age-related Macular Degeneration. Age-related macular degeneration is an eye condition that is most common among older adults, and it blurs your central vision.

As many as 11 million people in the United States have some form of age-related macular degeneration.

While AMD is highly prevalent among older people in the US, it accompanies several unpleasant implications.

According to a study by The Lancet, age-related macular degeneration is the 3rd leading cause of moderate to severe visual impairment, preceded by uncorrected refractive error and cataracts.

Before we dive into the details of the management of macular degeneration , lets take a brief overview of its main types.

Age-related Macular Degeneration has two forms:

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What Is An Eye Chart

During an eye test, eye doctors use eye charts to measure your vision at a set distance and compare it with other human beings.

Eye doctors can use different eye test charts for different patients and situations. The three most common eye charts are:

  • Snellen eye chart

  • “Tumbling E” eye chart

  • Jaeger eye chart

We’ve included a link to download your very own eye chart after each section below. You can print these charts and test your vision right in your own home.

When Sudden Vision Loss Is Serious

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According to Newman, eye problems, including vision loss, may signal a problem within the brain. Many common neurological problems have eye manifestations, he says. Depending on where its located in the brain, a tumor may cause double vision, as mentioned above, abnormal eye movements or decreased vision. Acting on these visual cues may allow you to catch problems like cancer sooner and have a better shot at treating the underlying condition and improving symptoms.

Another rare but serious cause of sudden vision loss is stroke. Should a bleed or interruption of circulation occur in the portion of the brain responsible for visual processing, you may experience vision loss in one eye or, more commonly, trouble seeing to one side.

Even if symptoms subside, you may still have had a ministroke or transient ischemic attack , so be sure to talk to your doctor.

It is sometimes possible to limit the effect of a stroke or even reverse the symptoms if the patient is seen immediately at an emergency room with a stroke team available, says Newman.

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Reduced Sensitivity For Color Contrasts:

As the macula undergoes damage, the visual acuity gets compromised. The precision of an image, its texture, and color appears dim, and thus you may find it difficult to differentiate between 2 objects with similar hues of color.

To counteract this problem, a simple solution would be to either paint such areas in bold colors or help set them apart visually by using neon-colored tape along each steps edge.

See Through The Eyes Of Someone With An Eye Disease

With most severe eye diseases, you may not have symptoms until the disease is advanced.

Most eye diseases exist in the background, but are very treatable if caught early, says Northwestern Medicine Neuro-ophthalmologist Nicholas J. Volpe, MD. Thats why its so important to get yearly eye exams and know your family history so that you can give yourself the opportunity to receive treatment.

Here are some common eye diseases and how they can affect your vision.

What they are: Buildup of proteins that cause cloudiness and change in color of the lens of the eye.

Effect on vision:

  • Glare or halos around lights, especially at night
  • Gradual clouding
  • Dimmer with a slight yellow or brown hue
  • Lack of contrast
  • Uveitis, or inflammation of the eye

What it is: Fluid buildup in the eyes causes pressure, damaging the optic nerve.

  • The optic nerve contains millions of tiny nerve fibers.
  • As the pressure damages these fibers, you begin to develop blind spots in your vision.
  • You may not notice this until most of your optic nerve has been damaged.

Effect on vision:

  • Peripheral vision loss can be so slow you may not realize it is happening
  • Early stages: loss of peripheral vision
  • Late stages: loss of central vision and peripheral vision
    • Vision remains as an arc around the center of your sight.
  • Arc of vision may be muted or darker
  • Can cause top or bottom blindness, meaning you may lose the top or bottom of your visual field
  • Can cause total blindness



Effect on vision:


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What Is Dry Amd

Dry macular degeneration is a common eye condition in older adults worldwide. Its onset usually happens at age 55 or older. In Dry AMD, the light-sensitive cells of themacula a structure within the retina of the eye become thinner with age. It does not show early symptoms, so you may not notice any distinct changes in your vision until it advances. Dry AMD develops gradually and causes loss of central vision, that is, the things in the direct line of your sight may begin to appear hazy and blurred.

An estimated 85 to 90 percent of people who suffer from AMD are diagnosed with the dry form.

This eye condition progresses in 3 stages early, intermediate, and late. At an early stage, vision appears normal, while people experience mild symptoms after some time, such as muddled images and difficulty seeing in dim lighting.In the advanced stage of AMD, you may notice that straight lines begin to look crooked. Blind spots begin to obstruct your straight-ahead vision a blind spot is a space within your visual field where the image gets cut off from view. You may first get foggy vision which leads to chunks of images that disappear altogether, making distinct blind spots in your central view.

During the course of its progression, Dry AMD may convert into Wet AMD at any point.In most cases, AMD affects both eyes. If you have it in one eye, the healthy eye compensates for the loss of vision in the defective eye, and it may not be evident for a long time.

Gaze And Tracking Based On Combination Of Central Vision And Peripheral Vision

Vision with Astigmatism Emphasized by Viral Tweet

Gaze and tracking control of a camera to a human face based on cooperative combination of central vision and peripheral vision, each of which has a simple processing method, is proposed. Figure 4 shows a flow chart of the proposed method. In this method, face area extraction using color information in the local central area of the visual field and person area extraction using object motion information based on difference images from gray scale images in the whole visual field, are defined as central vision and peripheral vision respectively. Use of WAF lens realizes high accuracy tracking and wide-angle moving object capturing by a single camera. In addition, the object motion information is utilized for intruder detection as another peripheral vision. These three kinds of image processing are carried out repeatedly with different processing period by WAFVS . This paper does not describe in more detail each of image processing algorithm characterized by the resolution property of WAF lens, because of limited space. Gaze and tracking is executed under rules in the following.

Figure 4. Flow chart of gaze and tracking

Figure 5. Three kinds of image processing for gaze and tracking

Orin Packer, David R. Williams, in, 2003

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More About The Sight Simulator

Excerpted from Sight Simulator shows you what its like to be legally blind, via CNET:

Ever wondered how the world looks to those with glaucoma or cataracts? A new interactive site lets you see for yourself.

The Sight Simulator is part of a campaign called See Now, aimed at increasing awareness of vision loss and calling for more Congressional funding to combat it in the United States. The Simulator places filters that mimic the effects of cataracts, glaucoma, and retinopathy on top of Google Street View images, enabling visitors to the site to move a slider and increase the severity of each.

The minimum setting on the site for all three conditions shows a view matching legal blindness. Its defined in the United States as central visual acuity of 20/200 or less in the better eye with the best possible correction, and/or a visual field of 20 degrees or less.

Legal blindness is not binary, the See Now site points out. For most people with vision impairment, its not a matter of seeing nothing versus seeing clearly. The reality is somewhere in between.

We believe when people experience what it would be like to lose their sight, from seeing what their own street looks like with poor vision, they will appreciate the problem in a way they never did before, Erin McCallum of the See Now campaign said in a statement. Hopefully this will motivate many people to look after their own eye health and push them to take action to help prevent blindness in others.

When To See A Healthcare Provider

In most cases, an episode of kaleidoscope vision isnt dangerous. However, it can be a sign of serious underlying conditions, including stroke, uncontrolled diabetes, or retinal migraines. Because of that, its important to see your healthcare provider after experiencing an episode of kaleidoscope vision, or if the vision changes last longer than an hour. Theyll rule out serious medical conditions, and help you develop a plan to treat or prevent migraines in the future. If you have symptoms of stroke, like numbness or confusion, call 911 immediately.

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Age And Other Causes Of Amd

Age is considered to be the greatest risk factor for the development of macular degeneration. Although a form of AMD, called juvenile macular degeneration can affect a person in adolescence, it is a rare condition. This condition is most common among older white Americans. People who are over 75 years of age are 30% more likely to be affected by AMD.

While age remains the most dominant risk factor, habitual smoking, a history of hypertension and diabetes can add to the risk of getting AMD.

In the light of these statistics, eye doctors put great emphasis on getting an annual eye exam once you cross 40 years of age. It is critical in identifying eye conditions at their early stage, so they can be treated timely and vision loss could be prevented.

Visual Symptoms Of A Migraine

What extreme shortsightedness (-11.0) looks like Normal eyes vs myopia and astigmatism

Kaleidoscope vision is a component of only one type of visual aura. Understanding the other types of visual disturbances that may accompany a migraine can provide more clarity.

The 3 types of visual auras are:

1- Positive Visual Aura

This is when a person sees something that isnt actually there. For example, a person experiencing a positive aura may see zig-zag or squiggly lines, flashes, stars, or dots. These perceived shapes may be colorful and move around the visual field or grow larger. A visual hallucination is also considered a positive aura.

2- Negative Visual Aura

This is characterized by any loss of vision during a migraine, whether partial or total. With negative auras, one may experience blind spots, loss of peripheral vision, or a brief period of total vision loss.

3- Altered Visual Aura

This type of aura distorts what you see without adding or subtracting anything. For example, one may perceive a straight line as wavy or blurred. Kaleidoscope vision is considered an altered aura.

Other forms of altered aura include misperceiving the size of an object , distorted distance perception, and distorted or absence of color.

If you experience any of the above symptoms with a migraine, seek medical attention to rule out more serious conditions, like retinal tearing or stroke.

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See What I See: Virtual Reality Eye Disease Experience

Eye disease affects millions of people. But describing vision loss is difficult. With NEIs virtual reality app, you can experience what its like to live with vision loss from common eye diseases.

To get started, download the NEI VR: See What I See app on your smartphone.

The app also features 4 quizzes to check your knowledge about age-related macular degeneration , glaucoma, cataracts, and diabetic retinopathy.

Disclaimer: The See What I See Virtual Reality Eye Disease Experience mobile application does not currently comply with the Web Content Accessibility Guidelines.

What Are The Symptoms Of Flashes And Floaters

Flashes appear as small sparkles, lightening or fireworks usually in the extreme corners of your vision. They may come and go. Floaters are more visible in bright light, or if you are looking at a plain bright background such as a cloudless sky or white wall.

Usually, the symptoms are nothing to worry about and you can get used to them. However, if you have any of the following symptoms, you should contact your optometrist as soon as possible:

  • a sudden increase in floaters, particularly if you also notice flashing lights
  • a new, large, floater
  • a change in floaters or flashing lights after you have had a direct blow to your eye
  • a shadow or cobweb spreading across the vision of one of your eyes.

If you cant contact your optometrist you should get urgent attention, ideally from an eye casualty department at the hospital. If you cannot get to an eye casualty you should go to a hospital A& E department.

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