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Doctor insights on: Herbal Treatment For Decreased Visual Acuity

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Dr. Al Hegab
57 doctors shared insights

Poor Vision (Definition)

Poor vision means vision is worse than 20/40. Best vision is 20/20. Most common cause is a need for new glasses, uncorrected astigmatism, cataract, dry eyes, lazy eye. Other possible causes include a poor diet (lack of veggies), macular degeneration, glaucoma. Let us know if you ...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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When documenting visual acuity rating what do the numbers mean?

Ratio: The ratio is an indirect way of measuring how small of an object can be resolved independent of the distance at which it is viewed. For snellen fractions (20/20 for example), the top number is represents the testing distance and the bottom number is an indirect measurement of the size of the object. ...Read more

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Does everyone have the same visual acuity versus light intensity response curve?

Does everyone have the same visual acuity versus light intensity response curve?

No: Evan an individual can vary in visual acuity range and light sensitivity function depending on the above factors plus genetic factors. So there likely will be some spread in the above between different individuals. ...Read more

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Please help? Is the meaning of visual acuity- the "ability to discriminate between two points"?

Close: A better definition would be the measurement of the minimum distance at which two points can be distinguished as two. We use a very weird and ancient way to write this down called snellen acuity. ...Read more

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What does the sphere of my prescription say about my visual acuity?

Near-, or farsighted: If the first number (the sphere) on your prescription has a + notation before it, you are hyperopic (or farsighted), which means you can see better far away than up close (relatively). If there is a - in front of that first number, then you are myopic (nearsighted) which means you see better up close than far away, relatively. ...Read more

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What does the sphere of my prescription say about my visual acuity? What is sphere?

What does the sphere of my prescription say about my visual acuity?  What is sphere?

Near or far sighted: Sphere is the degree of near (minus power) or far (plus power) sightedness. For example, -3.00 sphere is 3 diopters of nearsightedness. -4.00 would be even more nearsightedness. Put a + in front of those numbers instead, and that would be farsightedness. Sphere does not include any astigmatism, a.K.A. Cylinder. ...Read more

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Is there a way to find out your visual acuity without consulting your doctor?

Visual chart: Many places have a visual chart on the wall and you can use this to determine your acuity. There are also charts on the internet which you can google and even an app or two. ...Read more

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How do I find out my visual acuity based on my eyeglass prescription? Is that possible?

How do I find out my visual acuity based on my eyeglass prescription?  Is that possible?

You don't: Your prescription is the power of the lens which gives you the best possible vision. It doesn't say anything about what that level of vision is. Your visual acuity is tested wearing your best correction. ...Read more

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Does visual acuity decrease in cases of intracranial hypertension?

Does visual acuity decrease in cases of intracranial hypertension?

Sometimes: Many times patients develop transient obscurations of vision, or brief episodes of blurry vision. These are temporary if treatment ensues promptly. Long term high intracranial pressure can produce permanent defects in vision due to damage of the optic nerve. This condition needs to be closely monitored by both neurologists and ophthalmologists. ...Read more

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How can you measure visual acuity w/ the snellen eye chart?

Read smallest line: The snellen chart is a graded series of letters or numbers smaller as you go down. The uncorrected vision is the smallest line easily read with each eye. Your ophthalmologist will present you with lenses to improve the level of the smallest line to hopefully get you to 20/20 - the standard of normal. It is a subjective test requiring your active input. ...Read more

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How does the mirror affect the eye chart in a visual acuity test?

How does the mirror affect the eye chart in a visual acuity test?

Lengthens light path: Most offices do not have a 20 foot lane. But standards and available charts are made to reflect a 20 foot lane. The way to handle this is to use mirror (s) to reflect the image the proper distance to approximate a 20 foot lane. The letter images can also be enlarged or diminished as needed but this will change the standardization. A 20 foot light path is the standard. ...Read more

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Can visual acuity decreases in case of intracranial hypertension (iih or bih)?

Can visual acuity decreases in case of intracranial hypertension (iih or bih)?

Absolutely: Optic nerve damage leading to visual impairment or blindness can be caused by intracranial hypertension. This is why it is essential that an ophthalmologist is involved with the management of this disorder. ...Read more

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Is there a rough visual acuity test that anyone can perform without the eye chart?

Is there a rough visual acuity test that anyone can perform without the eye chart?

Yes: Your question specifically address visual acuity which is a measure of the acuteness of vision. If anyone has concerns about their acuity, please visit your optometrist or ophthalmologist. Acuity is best assessed one eye at a time. Roughly an eye should be able read newsprint (or smaller) at the normal reading distance. Now, it's easy to download apps for your phone to test acuity. ...Read more

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Is there a rough visual acuity test that I can easily perform?

Is there a rough visual acuity test that I can easily perform?

On line: You can "Google" Snellen acuity chart to get a rough idea of the vision. You can also compare the limits of your vision with someones vision who has known acuity. At your age, i assume that you have a driver's license and most likely have had to pass an acuity test to get that license approved. ...Read more

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Is there a way to find out your visual acuity with an app or website?

Vision screening: A rough acuity can be gained from any number of apps/sites - search for vision/eye exam and follow the instructions. If you are wondering about reading glasses - go to a place that sells them and they usually have a chart you can read with different readers on. None of this is as good as good eye exam. ...Read more

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Can docs explain what does visual acuity indicate?

Vision standard: In the USA the standard is the Snellen fraction of 20/20. The upper number means the letters are 20 feet away. The lower is the distance the normal could be to read the number. If someone is 20/200 at best, the letter is large enough that the 20/20 normal could be 200 feet away and still read it. Visual charts have a graded series of letter size to get the best fit. ...Read more

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Is there a way to convert contact lens power to a simple central visual acuity?

Is there a way to convert contact lens power to a simple central visual acuity?

No: The relationship between lens power and the standard vision fraction like 20/20 is not linear. These two items do not interconvert. ...Read more

Visual Acuity (Definition)

Visual acuity is the measure of the sharpness of vision. It is the most important measurement of eye function. In the us, the antiquated snellen visual acuity measurement is most often used. This is the "20/20" thing you have ...Read more


Dr. James Hocker
385 doctors shared insights

Phytotherapy (Definition)

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