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

Planning and implementation of nursing care - anaemia, Planning of Nursing ...

Planning of Nursing Care   The goals of nursing care are:  Administer oral iron supplements and parenteral iron therapy.  Provide nutritional counselling and educate t

What is a monohybrid cross, A monohybrid cross: A.Determines the genetic ma...

A monohybrid cross: A.Determines the genetic makeup of an organism B.always involves homozygous alleles. C.always involves organisms that are heterozygous at all loci. D.Always inv

Explain subclavian flap aortoplasty, Explain Subclavian Flap Aortoplasty ? ...

Explain Subclavian Flap Aortoplasty ? Initial steps are same as for resection and end-to-end anastomosis. After exposing a the entire length of intra thoracic segment of left s

How does the amoeboid movement occur, How does the amoeboid movement occur?...

How does the amoeboid movement occur? What are examples of beings and cells that use such movements for locomotion? Amoeboid movements are formed by cytoplasmic movements and p

Experimenting, what are some examples of eperimenting palants?

what are some examples of eperimenting palants?

Respective constituents of cell walls in bacteria , What are the major resp...

What are the major respective constituents of cell walls in bacteria, protists, fungi and plants? Ans) In bacteria cell wall is made of peptidoglycans; between protists algae ha

Define about the geriatric nutrition, Define about the Geriatric Nutrition?...

Define about the Geriatric Nutrition? Aging has been defined as "a series of time related process that ultimately brings life to a close." Persons of 60 years of age and older

Why plant nutrients is said to be essential, Why plant nutrients said to be...

Why plant nutrients said to be essential An element is said to be essential if,   (i)   The deficiency of an element in plant, makes it impossible to complete the vegetative

Features of phylum porifera and eumetazoa, Features of Phylum Porifera and ...

Features of Phylum Porifera and Eumetazoa Table: Distinctive Features of Phylum Porifera and Eumetazoa The branch Eumetazoa, as we have seen above, consist of meta

A disulfide bond can form between any two amino acids, A disulfide bond can...

A disulfide bond can form between any two amino acids that have sulfur in their side-chain.

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