Myopia vs. Hyperopia
Key Differences
Comparison Chart
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Formation of Image
Causes
Focal Length
Corrected by
Myopia and Hyperopia Definitions
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Hyperopia
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Hyperopia
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Hyperopia
Myopia
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Myopia
Myopia
Myopia vs. Hyperopia
The common eye problems are myopia or short-sightedness and hyperopia or long sightedness. These defects are also called “refractive errors or defects”. Myopia is a condition in which one person cannot see the far away things clearly but can see near objects while in case of hyperopia one person cannot see near things and can see far objects clearly. Myopia can be corrected by a double concave lens while hyperopia can be fixed by a dual convex lens. In the case of myopia, light refract in such a way that image formed in front of the retina but in case of hyperopia image formed behind the retina of the eye. In myopia eyeball size increases while decreases in hyperopia. The focal length of the eye lens decreases in myopia while increases in hyperopia.
What is Myopia?
Myopia is a condition in which the person cannot see distant objects. Short-sightedness occurs due to the formation of an image in front of the retina instead of on retina. Myopia is originated from the Greek word “Mumps” which means short-sighted. Therefore Myopia is also called short-sightedness. There are some causes of refraction of light and making an image in front of the retina than on retina which is inclusive curvature of cornea or lens, increases in axial length of the eye, increases in refractive index, the anterior position of the lens. Myopia has many types like congenital which is by birth, simple which is most common and starts from the age of 5-10 to 15-20 years, and this is due to curvature and length problem, pathological which is hereditary and progressive. Retinoscopy and A-scan Biometry methods diagnose myopia. Treatment of short-sightedness is possible by using a diverging lens like a concave lens, contact lenses and by the surgical approach in flattening of cornea and implantation of contact lenses.
Example
A student who is not able to see the counting or letters written on the classroom board is suffering from short-sightedness.
What is Hyperopia?
Hyperopia is defined as the condition or defect of the eye in which a person can see the far away things but is unable to see nearer things. Hyperopia is also known as hypermetropia. In this condition, the image is formed behind the retina of the eye. There are many causes which creates the image behind the retina of the eye; these are the curvature of lens and cornea is flattened than the regular, short axial length of the eye, decrease in refractive index and posterior position of the eye lens. Hyperopia is also called long-sightedness. There are also different types of hyperopia like total hyperopia, latent and manifest hyperopia. This type of defect is also diagnosed by A-scan Biometry and retinoscopy. Hyperopia can be treated by using the diverging convex lens, by making cornea central curve part more curved by the surgical methods.
Example
A person is suffering from the hyperopia if he cannot read the book in his hand.
