Can you explain myopia and hypermetropia, Biology

Assignment Help:

Q. How can the visual deficiencies known as myopia and hypermetropia be optically explained?

Myopia is the visual condition in which the images are formed previous to (in front of) the retina. Hypermetropia is the visual condition in which the point of image formation is further than (behind) the retina. Actually myopia is due to an increase in the distance between the crystalline lens and the retina, generally caused by a slight flattening of the eyeball and in hypermetropia the retina is too close to the crystalline lens due to slight shortening of the eyeball.

In myopia the far point and the near point of vision come closer (the refractivity of the crystalline lens that corresponds to the maximum distension capacity of the ciliary muscles isn't enough to provide visual accommodation). In hypermetropia the ciliary muscles aren't able to contract more to compensate the inadequate position of the retina that is the near point becomes more distant.


Related Discussions:- Can you explain myopia and hypermetropia

Explain the term of monosaccharides, Explain the term of Monosaccharides? ...

Explain the term of Monosaccharides? Monosaccharides :  The simplest carbohydrates are Monosaccharides, simple sugars. These generally have three to six carbon atoms, and con

Skeletal system - face, FAC E - It lies under the anterior part of ...

FAC E - It lies under the anterior part of cranium. It is composed of 14 bones. These includes 2 nasals, 2 maxillae, 2 palatine, 2 zygomatic, 2 lacrymals, 2 inferior

Ecological significance - conservation of wildlife, Ecological Significance...

Ecological Significance - Conservation of Wildlife  Besides serving as a valuable genetic reservoir, each species interacts with other species and plays a role in the transfe

Which is an isotope of pgisphorous, The most abundant from of phosphorous h...

The most abundant from of phosphorous has 15 protos, 16 neutrons and 15 electrons. Which of the following is an isotope of pgisphorous? (make all correct choices) A. an atom wit

What are the benefits of migration, What are the Benefits of migration ...

What are the Benefits of migration Eg: Need to leave Alaska due to harsh weather conditions (statement that birds are escaping NZ winter not acceptable). Longer day

Explain two capacities and volumes of respiratory, Given four respiratory c...

Given four respiratory capacities (a - d) and four jumbled respiratory volumes of a normal human adult: Respiratory Respiratory capacities volumes. 1.            Residual vol

Benefit of the double and complete circulation, Q. How many chambers do the...

Q. How many chambers do the mammalian heart and the bird heart have? Concerning temperature maintenance what is the benefit of the double and complete circulation of these animals?

What is periotest, What is Periotest Periotest: An electronic device ...

What is Periotest Periotest: An electronic device  originally developed by Schulte designed to measure the dampening effect or attenuation degree  characteristics of the peri

Spoilage of butter, Q. Spoilage of butter? Butter, which has a high con...

Q. Spoilage of butter? Butter, which has a high content of fat, is subject to rancidity and microbial spoilage due to contaminated cream from which it has been prepared

How to facilitate information transfer during transcription, How is energy ...

How is energy used to facilitate information transfer during transcription?

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd