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Difference Between Near Sightedness and Far Sightedness

Near-Sightedness-and-Far-Sightedness

Most people are born with normal eyesight. However, they experience changes in vision due to genetics and environmental factors. Nearsightedness and far-sightedness are two common conditions associated with eyesight. They may not be called eye diseases. Instead, they are “refractive errors.” They occur due to improper focus of the image on the retina.

Nearsightedness means that you can only see near objects clearly. Whereas, farsighted people have trouble looking at nearby objects in detail. These conditions are curable, and you can manage them using spectacles. Let’s tell you all differences between near-sightedness and far-sightedness.

Comparison Table

CharacteristicNearsightednessFarsightedness
Another nameMyopiaHyperopia
Clear visionNearby objectsDistant objects
PrevalenceMore prevalentLess prevalent
Eyeball shapeLongerShorter
Image formationBefore the retinaAfter the retina
ProgressionDuring adolescenceTeenage
Lens powerNegativePositive
DiagnosisAcuity testRefraction exam

What are Refractive Errors?

Eyesight and vision are attributed to your eye’s ability to focus on the light rays and create an image. When the light rays fall on the pupil, they converge to form an image on the retina. The retina is a thin layer of tissue behind the eye. It plays a vital role in image interpretation and viewing. If your eye does not focus the light onto the retina, it can result in a refractive error. People with refractive errors wear glasses and contact lenses to see better. Corrective surgeries also help improve eyesight.

What is Near Sightedness?

Nearsightedness is one of the refractive errors in the eyes. It refers to seeing nearby objects clearly but the inability to focus on distant objects. It is also known as Myopia. Nearsightedness results when the eyeball is too long. It does not focus the light onto the retina. Instead, the light converges at a point before the retina. Due to this, distant objects cannot be observed properly and appear blurry. Nearsightedness may also occur if the curvature of the lens is more steep than normal. The prevalence of near-sightedness is more than farsightedness. It usually develops during childhood and worsens over adolescence.

The management and treatment depend on the severity of the condition. Some people may need to wear glasses all the time. On the contrary, some may only need them to look at a projector screen, and others require them when driving. Lenses for nearsightedness have a negative number. A higher number means worsening of the condition that requires a high-power lens.

Diagnosis of Near Sightedness

If you have seen a person reading a chart with differently-sized alphabets on a wall, that’s an acuity test. The acuity test is one of the basic assessment tests for nearsightedness. Further tests are later performed if you find difficulty reading those words.

Near-Sightedness

What is Far Sightedness?

Farsightedness is the opposite of near-sightedness. People with far-sightedness can only see distant objects and struggle with focusing on nearby objects. It is also known as Hyperopia. As opposed to nearsightedness, the eyeball of a far-sighted person is shorter than usual. The light converges behind the retina instead of on it. Far Sightedness may also develop if the lens is flatter than normal. Some children might be born with farsightedness.

People with far-sightedness usually wear glasses for reading and workings on computers. Besides glasses, they can use contact lenses and have corrective surgeries. Lenses for farsightedness have a positive number.

Diagnosis of Far Sightedness

Farsightedness cannot be examined in the same way as nearsightedness. It is especially difficult to evaluate cases of low to mild far-sightedness. Thus, most far-sightedness cases require a refraction examination and eye health assessment to diagnose far-sightedness.

Far-Sightedness

Similarities Between Near Sightedness and Far Sightedness

  • Nearsightedness and far-sightedness are refractive errors.
  • They are caused by a difference in the shape of the eyeball.
  • Common symptoms of both include eye strain, headache, or squinting. 
  • People with near sightedness and far sightedness need glasses, contact lenses, or corrective surgeries to see properly.

Differences Between Near Sightedness and Far Sightedness

Definition

Near Sightedness

Nearsightedness is a refractive disorder in which people can see only nearby objects clearly.

Far Sightedness

Farsightedness allows people to see only distant objects clearly.

Other Name 

Near Sightedness

The other name for nearsightedness is Myopia.

Far Sightedness

Whereas the other name for far-sightedness is Hyperopia.

Clear Vision

Near Sightedness

You can see nearby objects clearly in nearsightedness.

Far Sightedness

On the other hand, you can see faraway objects clearly with farsightedness.

Blurred Vision

Near Sightedness

Nearsightedness does not allow you to see distant objects clearly.

Far Sightedness

Contrarily, near objects seem blurred in far-sightedness.

Prevalence

Near Sightedness

Nearsightedness is more prevalent than far-sightedness.

Far Sightedness

Yet, far-sightedness is less prevalent compared to near-sightedness.

Eyeball Shape

Near Sightedness

The eyeball of people suffering from nearsightedness may be too long.

Far Sightedness

Alternatively, people with far-sightedness have shorter eyeballs than others.

Image Formation

Near Sightedness

When the light converges, it forms an image before the retina in nearsightedness.

Far Sightedness

Whereas the image is formed after the retina, giving an unclear view of nearby objects.

Progression

Near Sightedness

Nearsightedness develops during childhood and worsens over adolescence.

Far Sightedness

Some children may be born with far-sightedness. 

Lens Power

Near Sightedness

Lenses of near-sighted glasses or lenses have a negative number. A higher number means more power is needed to correct the issue.

Far Sightedness

While far-sighted lenses have a positive number. The power of lend increases with the increase in number.

Diagnosis

Near Sightedness

Nearsightedness can be diagnosed by an acuity test. You are asked to read a distant chart with the alphabet on it. 

Far Sightedness

While the doctors typically diagnose far-sightedness through a refraction examination and eye health assessment.

The Bottom Line

Nearsightedness and far-sightedness are refractive disorders that make your vision blurry. Near-sighted people can see nearby objects clearly. On the other hand, far-sightedness lets you see distant objects. It is usually due to the size of the eyeball and light convergence. Both these conditions can be managed with glasses and lenses or through corrective surgery.

FAQS

Nearsighted vs Far-sighted which is more common?

Nearsightedness is more common than farsightedness. People usually develop near-sightedness in early childhood or teenage.

What is astigmatism?

Astigmatism is a genetic disorder in which your vision is blurry at all distances. It commonly results from imperfection in the curvature of your eye’s lens or cornea. Sometimes, you may also get astigmatism following an injury.

Can you be near-sighted and far-sighted at the same time?

Yes, you could be near-sighted and far-sighted at the same time. This condition is called anisometropia. It happens as a result of different refractive powers in both eyes.

What causes nearsightedness?

Nearsightedness occurs when the light rays refract incorrectly due to your eye shape. It focuses on the image in front of the retina before it.

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