Explain about the term accommodation, Biology

Assignment Help:

Explain about the term accommodation.

Normally, the human eye focuses at objects at infinity, without exerting any power. This implies that while a person is observing an object at infinity, the eye is at rest and no effort is needed to focus on the object. If the object moves closer from infinity, till a distance of 6 meters from the eye, still no additional power or effort is required to be able to focus on the object. However when an object moves closer than 6 meters, the light rays entering the eye from the objects is more divergent. So as to bring these divergent light rays into focus over the retina the diopteric power of the eye must be increased. The mechanism by which the eye increases its diopteric power and hence the ability to focus at an object close to 154 the eye is called Accommodation.

1934_Ray of light focussed behind the retina.png

Ray of light focussed behind the retina (dotted line) before accommodation, and on the retina (solid line) with the help of accommodation


Related Discussions:- Explain about the term accommodation

Urolithiasis, Ur o l it h i a s i s The presence of calculi (u...

Ur o l it h i a s i s The presence of calculi (urolith) in the urinary system is termed as urolithiasis, and the disease is characterized by distension of bladder and

Respiration, essay on respiratory structures of living organisms

essay on respiratory structures of living organisms

Examine six bad listening habits, Discuss six bad listening habits. Which d...

Discuss six bad listening habits. Which do you think is the biggest challenge for you personally?

What is endocytosis , Endocytosis is the uptake of extracellular macr...

Endocytosis is the uptake of extracellular macromolecules   across the plasma membrane into the cell. The objects to be ingested is progressively  enclosed by a  small  portion  of

Define fish as a rich source of protein, Define Fish as a rich source of pr...

Define Fish as a rich source of protein? The edible portion is skeletal muscles of the body. Even though the skeletal muscles of different animals are basically similar, fish s

Tetanus, Tetanus This is an infectious, non-febrile disease of animals...

Tetanus This is an infectious, non-febrile disease of animals and man, and is characterised by spasmodic tetany and hyperaesthesia. The causative agent is Clostridium tetani,

What is portal and rental circulation, What is Portal and Rental Circulatio...

What is Portal and Rental Circulation ? The body has other circulation systems that do not return blood directly to the heart. For instance, the blood that drains from the abdo

Define the structure of hemicellulose, Structure of Hemicellulose When ...

Structure of Hemicellulose When compared with cellulose, it has lower degree of polymerization, more readily soluble in acid and alkali and non-fibrous. On hydrolysis, it predo

What do you mean by amphibians of the plant world, Q. Why can the bryophyte...

Q. Why can the bryophytes be considered the "amphibians of the plant world"? Like adult amphibians, the bryophytes live in the terrestrial environment but they depend on water

Sea, sea divisions

sea divisions

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