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

Clinical reasoning , Upon admission the DPU nurse notes: Fasting sta...

Upon admission the DPU nurse notes: Fasting status - fasted from 12 midnight, no morning medication taken. Consent - signed Pre anaesthetic check Test results

Explain some do's and don'ts when working in laboratory, Explain some Do's ...

Explain some Do's and Don'ts when working in Laboratory? 1) Always wear a lab coat when working a laboratory. 2) Ensure that no harm is caused to yourself or the people work

Explain immunogenicity, Immunogenicity  The safety and immunogenicity o...

Immunogenicity  The safety and immunogenicity of the new vaccine was evaluated in two unpublished studies that are summarized in the package insert. Among 1280 adults (18-55 ye

Fossils formed by organisms that resemble modern, The oldest fossils look a...

The oldest fossils look as though they were formed by organisms that resemble modern?

What is the function of the collagen fibers, What is the function of the co...

What is the function of the collagen fibers of the connective tissue? There are dissimilar collagen types. The major function of these proteins is to keep the shape and the str

Zoology, find the habits and habitats of scyphas?

find the habits and habitats of scyphas?

Water absorption in digestive system of mammals and bird, Q. Compared to ma...

Q. Compared to mammals do birds absorb more or less water in their digestive system? Why is this phenomenon an adaptation to flight? Bird feces are more liquid than mammal a fe

Explain nelfinavir, Explain Nelfinavir (NFV, Viracept)  Nelfinavir is a...

Explain Nelfinavir (NFV, Viracept)  Nelfinavir is a commonly used protease inhibitor because it is well tolerated. It appears to be less potent than lopinavir/ritonavir or efav

Respiration, #question.what are the organs of respiration in the lwer form ...

#question.what are the organs of respiration in the lwer form of animals .

Define procedure for testing the presence of urea in milk, Define Procedure...

Define Procedure for Testing the Presence of Urea in Milk? 1. To 0.5 ml of milk add 0.5 ml of  DMAB solution  (prepared by dissolving 0.4 gm of p-dimethyl amino benzaldehyde po

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