Common eye defects, Biology

COMMON EYE DEFECTS -

1.       Glaucoma - Pressure of aquous humour is increased, retina is degenerated.

2.       Presbyopia - Due to non etastic cilliary muscles, image of far and near place is not clear, generally it takes place in old age. Bifocal lens is used.

3.       Toris - Upper eye lid is hanged down due to weakness of muscles.

4.       Irtis - Due to inflamation of iris

5.       Ophthalmitis - Inflamation of iris & cilliary body.

6.       Trichoma - Mainly responsible for blindness. Under eye lids granules are formed. Caused by Chlomidia trachomatis.

7.       Far sightedness or Long sightedness or Hypermetropia - Diameter of eye ball is reduced. Object of far distance can be seen clearly. Near objects are not seen clearly. Focal point is formed behind retina convex lens is used. Jaeger's chart is related to it.

239_common eye defects.png

8.       Near sightedness or myopia - Diameter of eye ball is increased. Near objects can be seen clearly. Far objects are not seen clearly. Focal point is formed before ratina. Concave lens is used. Smellen's chart is related to it.

9.       Ptosis - Falling or droping of eye lids.

10.     Colour blindness - Ishihara's chart is related to it.

Posted Date: 10/3/2012 4:31:32 AM | Location : United States







Related Discussions:- Common eye defects, Assignment Help, Ask Question on Common eye defects, Get Answer, Expert's Help, Common eye defects Discussions

Write discussion on Common eye defects
Your posts are moderated
Related Questions
Explain about the Observation and Classification of Arthropoda? Introduction In the previous unit you have examined the representatives of artliropoda.  In this unit, you wi

Illustrate the techniques of neurology A long-standing technique in neurology has been observed the effects on behaviour of lesions (cutting) or ablation (removal) of nerve tis

Q. What is the vena cava? Which type of blood circulates within the vena cava? The vena cava is either of two large veins that debouch into the right atrium the superior vena c


Concerning their biological function what is the difference between DNA and RNA? DNA is the source of information for RNA production (transcription) and therefore for protein s

what is the biological significance of the skeleton and supporting system in animals

Q. Symptoms of hiatus hernia? In most patients, no symptoms are seen. When symptoms do occur, they are: 1. discomfort after heavy meal, 2. Difficulty in breathing while l

What is the evolutionary importance of pteridophytes? As the first tracheophytes, pteridophytes were also the first plants to extensively colonize the terrestrial environment f

Q. Major objectives of diarrhoea? The major objectives in the management of diarrhoea include: 1. Fluid and electrolyte replacement 2. Removal of cause (especially if inf

Explain about the Texturization? Proteins constitute the basis of structures and texture in several foods, whether these come from living tissue (myofibrills in meat or fish) o