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Doctor insights on: Home Remedies For Decreased Visual Acuity

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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


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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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Please answer! what prescription for 20/40 visual acuity?

Please answer! what prescription for 20/40 visual acuity?

Depends: As a rule of thumb, the strength of the prescription needed to correct 20/40 vision is about one diopter. It may be one diopter of correction for nearsightedness, farsightedness, astigmatism, or a mix of astigmatism with nearsightedness or farsightedness. Your eye doctor will perform a refraction to determine the exact prescription and an exam to rule out a medical cause for blurred vision. ...Read more

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Can you determine visual acuity by looking at prescription?

No: There is not a direct relationship between Snellen acuity (like 20/20 or so) and the diopters printed on an eyeglass prescription which is the formula used by the optical shop to make your glasses. ...Read more

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What causes sensitivity to light changes for visual acuity?

What causes sensitivity to light changes for visual acuity?

Sensitive to light: Or photophobia is non specific. It can indicate problems with vision or if associated with headches and neck pain and fever can be from infection or meningitis. You need to watch your symptoms if worsening go to the er. If stable you might be able to go to an eye doctor instead. Any visiual changes should be seen by your eye doctor. ...Read more

Dr. Oscar Novick
57 doctors shared insights

Poor Vision (Definition)

Decreased visual acuity is a loss of visual clarity. It can be a normal part of aging, be nearsightedness or farsightedness, or be due to changes in the ...Read more