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Doctor insights on: Understanding Eye Vision Test Results

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Dr. Richard Bensinger
1,726 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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Two eye drs. Looking at visual field test result. One dr says it is normal & other says there's peripheral vision loss. Why the difference of opinion?

Two eye drs. Looking at visual field test result. One dr says it is normal & other says there's peripheral vision loss. Why the difference of opinion?

Interpretation: Interpretation of visual field change is somewhat subjective. As many as 5 cosequetive visual fields are necessary to show change over time. Peripheral changes can have a lot of "noise" in deciding whether or not it is real defect or not. Repetition of field testing and confirmation of defect over time is more accurate. Even then, there are many factors that can interfere in vf assessment. ...Read more

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I have off and on fever 99.2f and headache and my eyes drop from time to time. I know there's something wrong with me but my test results were clean?

I have off and on fever 99.2f and headache and my eyes drop from time to time. I know there's something wrong with me but my test results were clean?

Low grade temp: Any test can be negative if it is not testing the right thing, if you feel truly lousy get re-evaluated, if not keep watch ...Read more

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I just had a routine health check up and my test results showed occult blood and pus but not enough to be visible from the naked eye the report said t?

I just had a routine health check up and my test results showed occult blood and pus but not enough to be visible from the naked eye the report said t?

May be normal: If this is a urine test and you had your menstruation recently, this may be contamination during collection of sample, nothing to worry about. Repeat test if your doctor recommends in a time away of your bleeding period... ...Read more

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Hi doc, I want to ask. Based on test results of medical check-up that on my left eye cornea thickening. This is dangerous and what should I do?

Hi doc, I want to ask. Based on test results of medical check-up that on my left eye cornea thickening. This is dangerous and what should I do?

Not dangerous: Increased corneal thickness is often a sign of swelling of the cornea. Your ophthalmologist can tell you if you have corneal swelling and treat it as well. ...Read more

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A severe herniated disc 6/7 in neck. Waiting for results if a few tests before I see neuro again. Blurry vision, head and neck pain? Vision scares me?

A severe herniated disc 6/7 in neck. Waiting for results if a few tests before I see neuro again. Blurry vision, head and neck pain? Vision scares me?

Maybe Unrelated: Herniated discs in your neck don't cause vision problems. The c6-c7 disc could cause many other sx. Such as neck pain, arm pain, hyperreflexia. Neck problems can also cause hedaches in the back of the head known as occipital neuralgia. Your vision should absolutely be assessed by a board-certified opthalmologist. You should also probably see a neurologist for the most comprehensive workup. ...Read more

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Frustrated but not depressed. Lots of test results with little things wrong led my GI to diagnosis IBS & suggest different psych rx. Should I take this as a hint - it's all in my head? Sick of feeling sick.

Frustrated but not depressed. Lots of test results with little things wrong led my GI to diagnosis IBS & suggest different psych rx. Should I take this as a hint - it's all in my head? Sick of feeling sick.

IBS is real illness: Ibs is thought to occur because of changes in chemical receptors that line your gut. You GI tract forms from the lowest layer of your brain as a fetus. This layer sloughs off and heads south, carrying all the nerve transmitters and receptors with it that are in our brains. This has led to a new name for the gut, namely the third brain. This is why psych meds are often used in ibs. ...Read more

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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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I took vision express online eye test and it said that my eyesight was 17% above average, what to do?

I took vision express online eye test and it said that my eyesight was 17% above average, what to do?

Celabrate: You vision is better than most. That does not mean you do not need routine examinations, or there is no problems with your eyes. ...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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I was wondering if there are any test to acquire night vision by eye surgeries? .

I was wondering if there are any test to acquire night vision by eye surgeries? .

If: If your night vision has never been good--this may be genetic or it may be from undercorrected eye glasses or contacts. Have your eye doc do a measurement in the dark to see if it is different than a "day time" measurement. ...Read more

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I cannot really understand what happens to the eye in the case of glaucoma. But how's your vision with it?

I cannot really understand what happens to the eye in the case of glaucoma. But how's your vision with it?

Not usually: Glaucoma is often silent as you are not able to tell when there is slight damage to the visual field. Furthermore, when eye pressure is an issue, high pressure in the eye, up to about 30, can feel totally normal. No pain, no visual symptoms, or external signs may be present. Only in the late stages does the field constrict to become symptomatic. Prevention is always better so best to get exam. ...Read more

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Can I use sph, cyl and axis of my eye test to rate my vision strength?

Can I use sph, cyl and axis of my eye test to rate my vision strength?

No: These numbers do not translate directly into a snellen acuity number (like 20/20). The degree of visual clarity is different than the eyeglass strength to achieve that clarity. ...Read more

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How do I read the results of my eye exam to know how bad my vision really is?

Difficult: A problem is that the number you receive for your eyeglass prescription does not easily correlate with the snellen fraction (the one that says 20/20 or whatever). So for instance a +2.00 correction might see 20/40 uncorrected while a -2.00 (note the sign) correction might see 20/100 uncorrected. Ask your ophthalmologist how bad your vision is in a meaningful way if this is important. ...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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Eye technician said my vision is 20/20, but exam result -.25/-.50. So then my vision technically isn't 20/20, am I correct?

Eye technician said my vision is 20/20, but exam result -.25/-.50. So then my vision technically isn't 20/20, am I correct?

May be 20/20: The technician may have been referring to you uncorrected vision or your best corrected vision as being 20/20. The other numbers (-.25, -.50) refer to the refractive error of your eyes. That is a very low nearsighted prescription, and many people would see 20/20 uncorrected even if they did not use that low prescription. You might have a sharper 20/20, or even better than 20/20 wearing that Rx. ...Read more

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What do you suggest if I could use sph, cyl and axis on my eye test to rate my vision strength and if yes how to rate my vision strength?

What do you suggest if I could use sph, cyl and axis on my eye test to rate my vision strength and if yes how to rate my vision strength?

Yes: The best number to use is sphere (sph). If you are nearsighted or myopic the number has a minus sign in front of it. The higher the number, the worse your uncorrected vision is.
If you are farsighted, the number is a plus sign and the same applies. The cyl stands for cylinder and is a measure of astigmatism. The higher the number, the worse the astigmatism ...Read more

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Had a eye test and eyes seem fine but I keep seeing a black dot in my vision and even when I close my eyes. It stays on one position then goes?

Had a eye test and eyes seem fine but I keep seeing a black dot in my vision and even when I close my eyes. It stays on one position then goes?

Vitreous floater: It sounds like you have vitreous floaters, little grayish spots of differing shapes in the vitreous cavity of your eye. These increase with aging, myopia, lattice degeneration, and can arise from retinal tears, inflammation, trauma, surgery. The dilated eye examination is important to rule out serious causes that need treatment. As long as this has been done, just monitor for change. ...Read more

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I went for a vision field test and I think I was supposed to cover one with an eye patch to see the flashing light but I didn't? Is this a problem

I went for a vision field test and I think I was supposed to cover one with an eye patch to see the flashing light but I didn't? Is this a problem

Incorrect test: Visual field testing is done one eye at a time. The fields of each eye overlap and doing it with both eyes will combine the input from each eye. If you had the test this way, the result will be largely meaningless. Did you have this done by an optometrist? Or did you see a real doctor - an ophthalmologist.? ...Read more

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Wondering why eye vision went from -2.25 to -2.75 within less than a year. Seems a lot. Was stressed between that time. Recent opthalm. Test: VGood.

Not significant: The final numbers for vision are based upon subjective information which includes how you felt on the day of the examination, how sharp was the eye doctor doing the measurements, lighting in the room, etc. There is some room for values to be up and down. Your number went up 0.50 which is not a great movement and may reflect these uncertainties. Nothing here to worry about. ...Read more

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Docs, could getting an eye test cause double vision?

No: Have no conceivable idea how an "eye test" could cause double vision. Perhaps the eye test was done to evaluate your double vision. ...Read more

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Does a vision field test show weaking muscle of the eye?

Generally not: Visual field tests are used to assess optic nerve function, most commonly in glaucoma. They can be used to identify possible strokes as well. The only weak muscle that could be identified would be the upper eyelid muscle in ptosis, as this would show obstruction of the superior visual field. ...Read more

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How can a eye doctor test for double visions?

Several types: The most common doubling of vision is when the eyes are out of alignment from defects in the nerves to the eye muscles or changes in the socket like trauma and tumors. Testing these is obvious by covering one eye and seeing if the doubling ends. Refinements of this can determine the muscles involved. Less common is doubling in one eye from defects in the lens or retina. ...Read more

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How does a eye doctor test for someone for double visions?

How does a eye doctor test for someone for double visions?

Complete eye exam: There are lots of causes of diplopia.
Generally, an ophthalmologist will perform the following exam in the office:
vision
refraction
eye movement testing
full dilated eye exam
additional orthoptic or neurological examination may be neccessary
this will guid the doctor as to whether other testing is required. ...Read more

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I went to get a regular vision test and was told my eye seemed swollen behind. I have to see a specialist and I am scared. What could this mean?

I went to get a regular vision test and was told my eye seemed swollen behind. I have to see a specialist and I am scared. What could this mean?

Many options: You are probably lucky that this was found. There are a number of reasons for swelling either in the back of the eye or behind the eye. I am guessing you are seeing an ophthalmologist who can sort this out for you. Eye treatment has advanced significantly in the last decade so I wouldn't worry at this point. Just be curious as to what it is. ...Read more

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Glaucoma in 1 eye. Damage to nerve. Dr. said is controlled & field hasn't changed but I have noticed vision change when driving. Why not show in test?

Glaucoma in 1 eye. Damage to nerve. Dr. said is controlled & field hasn't changed but I have noticed vision change when driving. Why not show in test?

Vision change: May indicate worsening glaucoma or poor control. Visual field test result may not be accurate. Consider talking to your eye doctor again for revaluation including ocular pressure check ...Read more

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I have a glass eye is it possible to pass vision test for diving?

Yes: You will have restricted depth perception and peripheral vision will be restricted. You will also have to verify with the state DMV for specific rules. ...Read more