high myopia exercises, advanced eye exercises

High myopia treatment:

hi dear ,

Today i am going to tell you the best way to correct myopia. as we all know that the shape of the eye ball is round (elongated). the main shape what it is at the time of birth is same even after 6 years. i would like to make something clear hear that at the time of birth the axial length of eye ball is 21.23 mm. it means it is 2 mm small at the time of birth and it takes 6 years to build a full size eye ball. 

 after 6 years the axial length of eye ball is 23.23 mm 

A task to do for all of you dearest....

1-look at your hand and touch the tip of your finger tip with the help of thumb...

2-touch your little finger with the help of thumb and count one... (1)

3-touch your third finger with your thumb and count two......(2)

4-touch your right finger and count three...(3)

5- touch your index finger and count four (4)

6-again touch your small finger...... and repeat the same.. 

(here you will find it very easy and enjoy doing it ?)

now come to the task

you all will have to reverse the this process 

like touch your index finger first (1) after that middle finger (2) and so on.... and repeat the same 20 times a day with both hands right and left hand. 

this is the task you will have to do. and comment me which way you find it difficult ?

now come to our main point high myopia...

after the age of 6 the eye ball size has become 23.23 or as usual ... 

but after the age of 6 the eye ball size still in the process of growth as before... 

it becomes 24,25,26 mm and so on .... so sad to the person who facing such type of growth... 

now i wanted to explain the definition of myopia (nearsightedness) here.

Definition of Myopia (Nearsightedness)

as we know that the average size of eye ball is in between 23.00 mm to 24.00 mm in this case the image if an object placed in front of eye beyond 20 feet takes focus in front of  the retina (with out any extra effort). 

means the image is not as clear as it should be projected on the retina. 

now you got my point ??

there are two types of myopia 

1- SIMPLE MYOPIA (UP TO 6)

2- PATHOLOGICAL MYOPIA (MORE THAN 6)

ETIOLOGY

MYOPIA  due to posterior elongation of eye ball it is called axial myopia

MYOPIA due to increase in CURVATURE of cornea. 

MYOPIA due to REFRACTIVE INDEX of eye. 

MYOPIA due to so many other environment factors

 

axial, curvature and refractive index myopia is all around but the pathological myopia is due to other factors ... 

this myopia is very complicated problem to all suffering from this refractive error . 

it is not a disease it is called the refractive error of eye ... it means it is an error created and imposed  by self or due to our wrong habit.  

main reason and treatment of high myopia

now we have come to know that this is not a disease, this is not more than a refractive error.. and the refractive error can be created by our-self and treated by only by ones own effort. 

what to do ? 

except pathological myopia we need to notice our wrong habit, by which we are in such pathetic condition of myopia (also called short or  nearsightedness ) 

first of all we all need to know our wrong posture/habit and try to correct that particular habi

 

 

Anti Reflection Coating

Introduction:

If a wire loop from a child’s blow-bubble tub is dipped in to the soapy solution, and then held vertically, a movement of light over the soapy film takes place. A number of colored bands will be seen if the light is reflected from the soapy surface. As the soap drains downward due to gravity, the appearance of bands changes. and we are left with an almost completely non-reflecting area at the top. After some time, the bubble bursts, because it has become too thin to support itself.

Aim:

If we were to coat the surface of glass lens with a thin film of magnesium fluoride, to the thickness of one quarter of the wavelength of light then in theory we would get a non reflecting surface. Provide that the refracting index of coating allows the two reflected rays to be of equal intensity, there would be no reflection.

Method:

It is not possible to get such type of material which will achieve this condition with low index glasses. Co complete extinction of the two rays will not occur.

An incident ray strike the first surface of lens, 4.3% light is reflected by the first surface and 4.3% light reflected by the second surface of the lens. Only 91.4% light can be transmitted through the glass (crown glass).

If thickness of the magnesium fluoride coating were to have a thickness equal to half the wavelength of the light, reflected rays along both paths would be in phase and reflection would be increased.

If, however the coating is only one quarter of a wavelength thick, the reflected rays will be half a wavelength out of phase and therefore tend to cancel each other. The result will be reduction of reflection and an increase in transmission.

The amount of light reflected at a surface, depends upon the refractive index of medium. A formula to calculate this was derived by French physicist, Fresnel

                                                (n1-n2/n1+n2)2

Where n1 and n2 are refractive indices of first and second substances respectively.

Spectacle crown glass would give the following result:

(0.523/2.523)2=0.043

This means that each surface of the lens would reflect 4.3 per sent at each surface. If the glass which has a hire index, say 1.7,the reflection would rise to 13.4 per sent by both surfaces.

Summery: the advantages of coated lenses are numerous. Car driving at dusk, or playing golf in fading light, and the fact that any spectacle wearer need no longer fear that his eyes will be partially obscured by unsightly reflection from windows or lights. Patient who requires high corrections, particularly deep minus lenses will find that the corrections have a less ‘strong’ look, and that the appearance of power rings is less noticeable. So anti-reflection not only has a definite technical advantage, for any lens power, but a decided cosmetic advantage too.