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

Agro industrial-soaking, Soaking Soaking is an another inexpensive proc...

Soaking Soaking is an another inexpensive processing method, which does not require much technical know how, is commonly practiced for improving the palatability of chaffed cro

Explain transposition the great arteries with ventricular, Explain Transpos...

Explain Transposition the Great Arteries with Ventricular Scptal Defect ? Transposition of the great arteries with VSD is an indication for surgery. It is preferable to do VSD

Zoology, About phylum platy helmenthus

About phylum platy helmenthus

Aibp-utilization of alternate feed resources, Utilization of Alternate Feed...

Utilization of Alternate Feed Resources Use of alternate feed resources is one of the potential areas for augmenting feed resource base in the country. However, the use of NCF

Cleavage - metazoa, Cleavage - Metazoa The unicellular zygote begins c...

Cleavage - Metazoa The unicellular zygote begins cell division (cleavage). First, the single cell divides forming two cells, these redivide further to form four, then eight ce

Define essential parts of photocolorimeter - monochromators, Define Essenti...

Define Essential Parts of Photocolorimeter - Monochromators? This is a means of selecting a sufficiently narrow waveband. Early colorimeters used glass filters that transmitted

Determine the food sources of manganese, Determine the Food Sources of Mang...

Determine the Food Sources of Manganese? The food sources of manganese along with their content are tabulated in Table. Here, you can see that whole cereals, nuts, leafy vegeta

Pomology, Pomology :  This is the study of fruits and fruit yielding plants...

Pomology :  This is the study of fruits and fruit yielding plants of commercial importance.  Pomology is a branch of botany which studies or cultivates pome fruit, and particularly

Penetrating injury, Penetrating Injury Open pneumothorax (sucking c...

Penetrating Injury Open pneumothorax (sucking chest wound)  Hemothorax  Tracheobrochiaf injury  Pulmonary contusion  Mediastinal injury

How is the circulatory system of birds characterized, Q How is the circulat...

Q How is the circulatory system of birds characterized? Like every vertebrate, Birds, have a closed circulatory system. The heart is similar to the mammalian heart, having four

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