What Is Defect Of Vision?

Are you curious to know what is defect of vision? You have come to the right place as I am going to tell you everything about defect of vision in a very simple explanation. Without further discussion let’s begin to know what is defect of vision?

Our eyes are our windows to the world, allowing us to see the beauty and wonder that surrounds us. However, not everyone is fortunate to have perfect vision. Many people experience various vision problems, commonly referred to as “Defects of Vision.” In this blog, we’ll delve into what defects of vision are, the most common types, and how they can be diagnosed and corrected.

What Is Defect Of Vision?

Defects of vision, also known as refractive errors, are abnormalities in the way the eye bends and focuses light onto the retina, leading to unclear or distorted vision. They result in difficulty seeing objects at various distances and can affect people of all ages. Four primary types of vision defects include:

  1. Myopia (Nearsightedness): Myopia occurs when the eyeball is too long, or the cornea is too curved. This causes light to focus in front of the retina rather than directly on it. People with myopia can see nearby objects clearly but struggle with distant vision.
  2. Hyperopia (Farsightedness): Hyperopia is the opposite of myopia. It occurs when the eyeball is too short or the cornea is too flat. In this case, light focuses behind the retina, making distant objects appear clearer than those up close.
  3. Astigmatism: Astigmatism arises from an irregularly shaped cornea or lens, which prevents light from focusing properly. People with astigmatism may experience blurred vision at any distance and may also have distorted or elongated shapes in their vision.
  4. Presbyopia: This vision defect is age-related and affects near vision as the eye’s lens loses its flexibility. Typically, presbyopia becomes noticeable around the age of 40 and necessitates reading glasses or bifocals.

Diagnosis Of Vision Defects

Diagnosing vision defects is typically done by an optometrist or ophthalmologist through a comprehensive eye examination. The following steps are involved:

  1. Visual Acuity Test: The most common eye test measures how well you can see letters on a Snellen chart. This test helps identify nearsightedness and farsightedness.
  2. Refraction Test: This test determines the degree of refractive error by having you look through different lenses and providing feedback on which lens provides the clearest vision.
  3. Astigmatism Testing: The astigmatism test involves looking at a series of lines or dots to determine if any appear distorted or blurred.
  4. Eye Health Examination: This comprehensive assessment includes evaluating the health of the eye, checking for diseases or conditions that may affect vision.

Correcting Vision Defects

The good news is that most vision defects can be corrected with the following methods:

  1. Eyeglasses: Prescription eyeglasses are the most common way to correct vision defects. They work by altering the way light enters the eye, so it focuses properly on the retina.
  2. Contact Lenses: Contact lenses provide an alternative to eyeglasses. They rest on the eye’s surface and help bend light correctly.
  3. Refractive Surgery: Procedures like LASIK can reshape the cornea to improve vision, reducing or eliminating the need for glasses or contact lenses.
  4. Bifocals or Progressive Lenses: For those with presbyopia, bifocal or progressive lenses are used to correct both near and distance vision.


Defects of vision are common but manageable issues that affect people of all ages. With the right diagnosis and corrective measures, individuals can enjoy clear and accurate vision, allowing them to experience the world in all its beauty and detail. Regular eye examinations are essential to detect and address any vision problems, ensuring the health and well-being of your eyes for years to come. If you suspect any issues with your vision, consult an eye care professional for a comprehensive examination and personalized recommendations for vision correction.


What Is The Defect Of Vision In Human?

There are mainly three common refractive defects of vision. These are (i) myopia or near-sightedness (ii) Hypermetropia or far – sightedness (iii) Presbyopia.

What Are The Main Causes Of Defect Of Vision?

It is caused due to:

  • High converging power of eye-lens (because of its short focal length), or.
  • Eye-ball being too long or cornea bulged.
  • Hereditary or due to uncontrolled diabetes or unattended cataract growths.

What Are The Two Defects Of Vision?

The two most common defects of vision are myopia and hypermetropia. Myopia can be corrected by using a concave lens and hypermetropia can be corrected by using a convex lens.

What Are The 3 Types Of Vision?

Common Eye Conditions

  • Nearsightedness – This is also known as myopia. …
  • Farsightedness – This is also known as hyperopia and is the opposite of nearsightedness. …
  • Astigmatism – The surface of the cornea or lens is not spherical, causing your eyes to focus at two separate points instead of one.

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