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Enquiry on myopia - Online Doctor Chats

Date : 13-Jan-2012
User rating for this question
Very Good Posted in: Vision and Eye Disorders
Answered by

General & Family Physician
Practicing since : 2004
Answered : 1770 Questions
Doctor :   Hi
User :   hello
Doctor :  
How can i help you?
User :   20/20 vision is a normal visual acuity. What general type of number would you expect to find in a person with myopia?
Doctor :  
may i know your age?
User :   32
Doctor :  
and gender?
User :   Male
Doctor :  
Ok.
Doctor :  
Myopia is shortsightedness.
Doctor :   it does not depend on the visual acquity.
User :   i want to know what general type of number would you expect to find in a person with myopia?
Doctor :  
As i said the number varies for every individual.
Doctor :  
It can vary from 12/20 to 6/20.
User :   can you give me in general?
Doctor :  
These are the general values.
Doctor :  
it is not that you have a specific number for myopia.
User :   could you please explain why a person cannot have both myopia and hyperopia at the same time, but can have astigmatism with either myopia or hyperopia.
Doctor :  
do you mean hypermetropia?
User :   hyperopia
User :   i think it is farsight
Doctor :   Yes.
User :   can you please explain my question
Doctor :  
generally these vision disturbances happen because of changes in the lens shape.
Doctor :  
the focusing power of the lens changes leading to these disturbances.
User :   that's it
Doctor :  
There are some people who have both myopia and hyperopia.
Doctor :  
it is not that you should not have both together.
User :   so people still have both myopia and hyperopia at the same time?
Doctor :  
Yes. they can have both together too.
Doctor :  
Is there any other query?
User :   yes
Doctor :  
Please proceed.
User :   Sound localization depends on two factors: User :   the difference in the loudness of the sound in each ear and how long was required for the sound to arrive at each ear.
Doctor :  
Ok
User :   Could you please explain how these two factors leads to your brain determining where a sound is coming from.
Doctor :   I will explain the best i could.

User :   yes please
Doctor :   The hearing mechanism is associated with multiple factors.
Doctor :  
they are as
Doctor :  
The hearing canal, tympanic membrane, the nervous supply and the brain.
Doctor :  
The sound which reaches the tympanic membranes creates the vibration on the membrane and the same is relayed by the neurons to the brain
Doctor :  
The brain recognises these impulse causing us to hear.
Doctor :  
Now the same happens with sound recognition.
Doctor :  
are you there?
User :   yes
Doctor :  
Ok
Doctor :  
what kind sound that is produced depends on the frequency of the vibration of the tympanic membrane, the type of neuron that relays it and the part of the brain that relays the information.
Doctor :  
These things help in the recognition of the sound also.
User :   are you finish for this question?
Doctor :  
yes.
User :   one more question please
Doctor :  
please proceed.
User :   Please explain why it is helpful that some sensory receptors quickly adapt, but other receptors slowly(if ever) adapt?
Doctor :   I would provide you with the this information after a little bit of research.
Doctor :  
Is that ok?
User :   yes please take your time
Doctor :   If it is then please give me your Email details so that i can send you the reply.
User :   YYYY@YYYY
Doctor :  
Ok
User :   when can i receive your answer?
Doctor :  
If there is any other query that needs clarification?
Doctor :  
I will be sending you the details by the end of this day.

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