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Doctor insights on: How Are Eye Vision Test Generally Scored

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How are eye vision test generally scored?

How are eye vision test generally scored?

Compared to standard: The chart used to test the eye is calibrated for normal vision at 20 feet. The outcome achieved is compared to what a normal eye can see at 20 feet. So if you can only see at 20 feet what a normal eye sees at 40 feet, your vision is considered to be 20/40. This is measured with and without corrective lenses at distance and at near. The vision with correction is considered to show the true vision. ...Read more

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Dr. Richard Bensinger
1,727 doctors shared insights

Vision (Definition)

Vision is a feature of a person's brain that allows him to see. He must have normal eyes, optic nerves (that stretch from the eyes to the back of his brain), and visual cortex (the vision center in the brain), in order to see properly. An ophthalmologist is a ...Read more


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How are the eye doctors test for color blindness?

How are the eye doctors test for color blindness?

Color charts: Most eye doctors own an ishihara color vision test booklet which can be used to determine if you are color deficient. There are other booklets as well, color caps, and other more sophisticated means to determine the degree and type of color deficiency you might have. ...Read more

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How accurate are DMV peripheral vision tests when you have glaucoma. Could test show more loss than what there really is.

How accurate are DMV peripheral vision tests when you have glaucoma. Could test show more loss than what there really is.

Meets standards: DMV tests are not designed to detect or monitor disease. They have a standard peripheral signal that you need to detect to determine the width of peripheral vision only. If your glaucoma has not progressed to the point of affecting peripheral vision, then you should be able to easily pass that test. ...Read more

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30yo w/ no eye DMG & prescription for vision is right; but have blurry, hazy vision, cannot focus eyes without concentration. Can i be considered legally blind?

30yo w/ no eye DMG & prescription for vision is right; but have blurry, hazy vision, cannot focus eyes without concentration. Can i be considered legally blind?

Doubtful: Sounds like you need a good eye examination by an ophthalmologist. I bet you can see well. You don't describe any actual eye disease so i suspect you just have inadequate glasses. ...Read more

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11 month old diagnosed with decreased vision from visual acuity test (teller). However, prescription test after dilating the eyes shows no prescription needed. Eye health is normal. Why this conflict?

11 month old diagnosed with decreased vision from visual acuity test (teller). However, prescription test after dilating the eyes shows no prescription needed. Eye health is normal. Why this conflict?

The teller cards: Give a good estimate of visual acuity in children. But, since it is testing the first reaction of a child when the card is presented, things like tiredness or distractions can affect the accuracy. The prescription measured after dilation is more of an objective measurement and can be done accurately. Continue follow up as your eye doctor recommended. Be well. ...Read more

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What are the best lenses for strabismus? (exo) are toric or multifocals better? Doctor said there can't be surgery at this stage. Also, are progressive/bifocal glasses better than single vision?

What are the best lenses for strabismus? (exo) are toric or multifocals better? Doctor said there can't be surgery at this stage. Also, are progressive/bifocal glasses better than single vision?

Lenses may not help: If you have a lazy eye, no lens will "fix" it. However, any lens that gets you to your best corrected vision will help but i usually recommend staying away from multifocals in lazy eyes. If you still have a muscle problem--this should be addressed by a strabismus surgeon. ...Read more

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How likely, percentage wise, someone under 30 get cataracts? Can eye doctor easily test for most or all types of cataracts? Easy cheap test?

How likely, percentage wise, someone under 30 get cataracts? Can eye doctor easily test for most or all types of cataracts? Easy cheap test?

Cataract : In a person with no health issues such as diabetes,it would be very unusual for cataracts to form before 30. Aging is the main cause most seen 60 and older. ...Read more

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What is difference bn retinoscopy and autorefraction? Can these both be used to test children (under 5) eye sight? Which one is preferred?

What is difference bn retinoscopy and autorefraction? Can these both be used to test children (under 5) eye sight? Which one is preferred?

Eye Exam: Retinoscopy is a technique to obtain an objective measurement of the refractive error of a patient's eye. It uses a special ophthalmacope to do this. An auto refractor uses a computer to do this. ...Read more

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In monitoring open angle glaucoma, if oct test results taken 1 yr. Apart are different, can it mean glaucoma isn't stable? No change in visual field.

In monitoring open angle glaucoma, if oct test results taken 1 yr. Apart are different, can it mean glaucoma isn't stable? No change in visual field.

Open angle glaucoma: By definition will diminish your retinal nerve fiber layer (rnfl) over time if not well controlled. Serial rnfl scans are highly sensitive and can detect small changes prior to a formal visual field test demonstrates changes. Questions if loss is occurring can be answered by looking at serial scans of the rnfl over time and looking for trends. So, yes, it may not be stable and requires follow up. ...Read more

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Can you tell me about what it means by visual acuity not exceeding 6/60 or 20/200 (snellen) in the better eye with correcting lenses?

Can you tell me about what it means by visual acuity not exceeding 6/60 or 20/200 (snellen) in the better eye with correcting lenses?

Lowered vision: The 20/200 line (6/60 in metric units) is usually the letters below the big "e" on the standard vision charts. This is also the level for legal blindness in most states. It is quite a lowering of vision and means that with the best eyeglass correction, only that level can be obtained. ...Read more

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Can you tell me if I have 20/20 vision in one eye and blurry vision in the other is my general eye sight still considered 20/20?

Can you tell me if I have 20/20 vision in one eye and blurry vision in the other is my general eye sight still considered 20/20?

No: It's only 20/20 in one eye and something else in the other. For certain purposes, such as driving a motor vehicle (depending on the state), you may be considered 20/20 generally. ...Read more

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Read that vision can fluctuate for months after lasik. Final result may take 6 months. How much can it fluctuate. Eyes are slightly different, 3 weeks?

Read that vision can fluctuate for months after lasik. Final result may take 6 months. How much can it fluctuate. Eyes are slightly different, 3 weeks?

3 months: The blurriness is from dryness and the healing process. The vision will be improved just not stable, 6 months is what i would expect for prk. Lasik is usually stable bison wise after three months. ...Read more

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Epiretinal membrane stage 2. Blur & glare on work computer w/headaches, but vision is 20/20. How can it be that good?

Epiretinal membrane stage 2.  Blur & glare on work computer w/headaches, but vision is 20/20. How can it be that good?

20/20 is just: one part of the equation for vision. It's quantitative assessment. This doesn't necessarily mean the quality of the "20/20" vision is normal. Also, the epiretinal membrane could be causing wrinkling in areas not responsible for your central best vision. I don't think this is the cause of your glare or headaches. Epiretinal membrane would cause distortion in vision. ...Read more

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How much can eye sight change in the months following lasik? Eyes are off by ~0.5. Will they equal out, blurry distance in dry right eye. 3 weeks post

How much can eye sight change in the months following lasik? Eyes are off by ~0.5. Will they equal out, blurry distance in dry right eye. 3 weeks post

Vision after LASIK : Vision after lasik can fluctuate quite a bit in the early postop period. Your prescription should stabilize as you get closer to 3-4 months postop. In the meantime, you should try frequent non-preservative artificial tears to eliminate any dryness present. ...Read more

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After dilation, eyes very blurred, but can see okay with glasses, when not dilated. Indicates cataract surgery? Is cataracts reversible?

After dilation, eyes very blurred, but can see okay with glasses, when not dilated. Indicates cataract surgery? Is cataracts reversible?

No: Everyone's vision becomes blurred with dilation for examination. Cataracts are an clouding of the eye lens that can occur naturally with aging. They are not reversible. However, surgery to remove and insert an artificial lens is indicated only when vision loss affects your activities of daily living, e.g. driving, watching TV, reading the newspaper. The surgery is brief and almost painless. ...Read more

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Single vision contact lenses for distance ? The vision in one eye is clearee than other eye, but together the vision is clear. Is this normal?

Could be: Not unusual for vision with contacts to be better in one eye than the other. But see your eyedoc to make sure everything is ok. ...Read more

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Can you tell me about peripheral vision, however are vertical or horizontal prisms used for peripheral vision loss?

Can you tell me about peripheral vision, however are vertical or horizontal prisms used for peripheral vision loss?

For motion detection: Central (macular) vision detects fine detail and colors. Peripheral vision has poor resolution but is highly sensitive to motion - it is your warning sensor for possible threats out of the center. Prisms affect both central and peripheral vision at the same time, so no prism will only change peripheral vision. Prisms are used to compensate for doubling; not a peripheral issue. ...Read more

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What do you call the diagram commonly used by ophthalmologist to test eyes vision?

What do you call the diagram commonly used by ophthalmologist to test eyes vision?

Many types: Visual acuity is often measured using the snellen chart, the one with the big "e" at the top. There are several variations of this chart in use today. Other charts are used to test for other features of vision. ...Read more

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What treatments are available for ghost vision in both the eyes?

What treatments are available for ghost vision in both the eyes?

See an eye doctor: It depends on the cause. You must see an eye doctor sooner rather than later. It may be a simple matter of a refraction (glasses and/or contact lenses). ...Read more

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