English

Explain the Term: Cataract - Biology

Advertisements
Advertisements

Question

Explain the Term: Cataract

Short/Brief Note
Advertisements

Solution

Cataract: It is a condition in which the lens turns opaque and the vision is cut down even to total blindness. It can be corrected by surgically removing the lens and by using spectacles with highly convex lense.

shaalaa.com
  Is there an error in this question or solution?
Chapter 8: The Nervous System and Sense Organs - Explain the Terms

APPEARS IN

ICSE Biology [English] Class 10 ICSE
Chapter 8 The Nervous System and Sense Organs
Explain the Terms | Q 13

RELATED QUESTIONS

Do you know that the corneal-impairment can be cured by replacing the defective cornea with the cornea of the donated eye? How and why should we organise groups to motivate the community members to donate their eyes after death?


Name the defect of vision in a person: 

whose far point is less than infinity


What is the scientific name of 

long-sightedness?


Your friend can read a book perfectly well but cannot read the writing on blackboard unless she sits on the front row in class. 

 Is she short-sighted or long-sighted?


Though a woman can see the distant object clearly, she cannot see the nearby objects clearly. She is suffering from the defect of vision called:
(a) long-sight
(b) short-sight
(c) hind-sight
(d) mid-sight


A person can read a book clearly only if he holds it at an arm's length from him. Name the defect of vision:  

if the person is a young man 


Given alongside is a diagram depicting a defect of the human eye. Study the same and then answer the questions that follow: 
(i) Identify the defect. 
(ii) Name the parts labelled 1, 2 and 3. 
(iii) Give labelled two possible reasons for this eye defect. 
(iv) Draw a labelled diagram to show how the above mentioned defect is rectified. 


The near point of the eye of a person is 50 cm. Find the nature and power of the corrective lens required by the person to enable him to see clearly the objects placed at 25 cm from the eye?


What are the causes of ‘Myopia’?


A student sitting at the back of the classroom cannot read clearly the letters written on the blackboard. What advice will a doctor give to her? Draw ray diagram for the correction of this defect.


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×