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प्रश्न
What is the least distance of distinct vision for a normal human eye?
उत्तर
The least distance for distinct vision for a normal human eye is about 25 centimeters.
संबंधित प्रश्न
List the parts of the human eye that control the amount of light entering into it. Explain how they perform this function.
Write the function of the following part of the human eye: ciliary muscles
The human eye can focus objects at different distances by adjusting the focal length of the eye lens. This is due to ______.
The optical prescription for a pair of spectacles is :
Right eye : −3.50 D
Left eye : −4.00 D
Which lens has a greater focal length?
The optical prescription for a pair of spectacles is :
Right eye : −3.50 D
Left eye : −4.00 D
Which is the weaker eye?
A person got his eyes tested by an optician. The prescription for the spectacle lenses to be made reads :
Left eye : +2.50 D
Right eye : +2.00 D
State whether these lenses are thicker in the middle or at the edges.
A person got his eyes tested by an optician. The prescription for the spectacle lenses to be made reads :
Left eye : +2.50 D
Right eye : +2.00 D
Which lens bends the light rays more strongly?
What is the:
near point of a normal human eye?
Name the part of our eyes which helps us to focus near and distant objects in quick succession.
How does this affect the amount of light entering the eye?
There are two types of light-sensitive cells in the human eye:
What is each type called?
Draw a simple diagram of the human eye and label clearly the cornea, iris, pupil, ciliary muscles, eye-lens, retina, optic nerve and blind spot.
If you walk from a dark room into sunlight and back again into dark room, how would your pupils alter in size? What makes this happen?
What shape are your eye-lenses:
when you look at your hand?
Suggest how your irises help to protect the retinas of your eyes from damage by bright light.
Which parts of the eye cause rays of light to converge on the retina?
Nocturnal animals (animals which sleep during the day and come out at night) tend to have wide pupils and lot of rods in their retinas. Suggest reasons for this.
Fill in the following blank with suitable word:
Having two eyes gives a ................field of view.
What are the advantages of having two eyes instead of just one?
Five persons A, B, C, D and E have diabetes, leukaemia, asthma, meningitis and hepatitis, respectively.
Which of these persons can donate eyes?
Having two eyes gives a person:
(a) deeper field of view
(b) coloured field of view
(c) rear field of view
(d) wider field of view
With reference to the functioning of the eye, answer the question that follow:
What is the shape of the lens during distant vision?
The figure below compares a part of our eye with a part of a photographic camera.
Name the corresponding parts of the eye the camera shown here that are comparable in function.
State the main functions of the following:
Seminal Vesicles
What is a stereoscopic vision?
Differentiate between:
Vitreous humour and Aqueous humour.
Draw a diagram of the human eye as seen in a vertical section and label the parts which suit the following descriptions relating to the:
(i) photosensitive layer of the eye.
(ii) structure which is responsible for holding the eye lens in its position.
(iii) structure which maintains the shape of the eyeball and the area of no vision.
(iv) anterior chamber seen in front of the eye lens.
(v) outermost transparent layer seen in front of the eyeball.
Explain the Term: Accommodation in the eye
Name the following:
The focal length of the lens is altered by the contraction of which type of muscles.
Give Technical Term:
Name the part of the retina on which an object is focused for the clearest vision.
Give Technical Term:
The fluid which conveys the vibrations of sound in the cochlea and semicircular canals.
State the Location:
Iris
Choose the Odd One Out:
Choose the Odd One Out:
Complete the following sentence with appropriate Word
The photoreceptor cells of the retina sensitive to colour are:
Complete the following sentence with appropriate Word
The aperture in the eye through which light enters is the:
Name the capacity of the eye lens to change its focal length as per need.
Write the function of the human eye and label parts of the figure given below.
Why the human eye is compared with camera?
A person cannot see distinctly objects kept beyond 2 m. This defect can be corrected by using a lens of power
Match the following:
| Column - I | Column - II | ||
| 1 |
Retina |
a | Pathway of light |
| 2 | Pupil | b |
Far point comes closer |
| 3 | Ciliary muscles | c |
near point moves away |
| 4 | Myopia | d | Screen of the eye |
| 5 | Hypermetropia | f | Power of accommodation |
With neat, labeled diagram describe the structure of retina of eye.
Match the following:
| Column - I | Column - II |
| 1. Retina | a. Pathway of light |
| 2. Pupil | b. Far point comes closer |
| 3. Ciliary muscles | c. near point moves away |
| 4. Myopia | d. Screen of the eye |
| 5. Hypermetropia | f. Power of accommodation |
Name the following:
Capacity of the eye to focus at different distances.
Name the following:
The layer of the wall of the eye-ball that corresponds to the black lining of the box of a camera
Write the main functional activity of the following structure.
Ciliary body and suspensory ligament
Differentiate between members of the following pair with reference to what is asked in the bracket.
Aqueous humour and vitreous humour (location).
With reference to human eye answer the question that follow:
Name the part of the eye associated with the regulation of the size of pupil.
