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 Myopia

Myopia

Myopia is a common eye condition that is becoming more widespread. Objects up close are  in focus while objects in the distance appear blurry. 

Myopia is reaching epidemic proportions as young people spend more time focusing on close work on their numerous digital devices. Once myopia starts in childhood, it usually gets worse and worse every year until the age of about 20-25. Unfortunately, the worse myopia gets, the higher the risk of future eye diseases. 

Luckily, research has shown that certain treatment strategies can delay or slow down myopia – which means less chance of getting an eye disease in the future.

 

What is myopia?

Myopia, also known as short sightedness and near sightedness, is an eye condition which is reaching epidemic proportions worldwide. It causes blurry distance vision, while objects up close remain clear and in focus.
This most often happens because the eyeball grows longer than normal.

 

Myopia definition

The definition of myopia is having a refractive error (or glasses prescription) of at least -0.50D in one or both eyes.

The opposite of myopia is hyperopia or hypermetropia (also known as long sightedness), which means having a refractive error of +0.50D or more. Hyperopia can cause blurry reading or close vision, and higher levels of hyperopia can also cause blurry distance vision. 

Optometrists distinguish between myopia and hyperopia during an eye examination. Believe it or not, sometimes one condition may mimic the other and several specialised tests may be required. Simply reading letters on a chart at a GP’s office or at a school vision screening does not give any information or diagnosis about what someone’s eye condition is. 

 

High myopia

The definition of high myopia has varied over the years, however it is generally considered to be high when the spectacle prescription reaches -5.00D or greater in one or both eyes. The higher the amount of myopia, the higher the risk of eye diseases such as glaucoma, cataract and retinal detachment.

 

Myopia causes

Myopia generally develops in the childhood or teenage years and this can be influenced by a combination of genetics, environment and other individual visual characteristics.
Some children are more at risk of developing myopia compared to others. Having any of the following risk factors puts a child at an increased risk of developing myopia:

 

Age  The earlier myopia begins the quicker the progression 
Ethnic Background  Myopia is much more common in children of East Asian descent
Family History  Having 1 myopic parent = 3x higher risk (2 parents = 6x risk)
Refractive Error Children should normally be long sighted (hyperopia). 
Time Spent Outdoors   Less than 1.5 hours per day increases myopia risk 
Time Spent on Near Work   More than 2.5 hours per day increases myopia risk

 

Why does myopia get worse every year?

Once myopia starts, it generally gets worse as time goes on. If it gets worse at a fast rate, there is more chance of ending up with high myopia.

 

Effects of myopia

Unfortunately, myopia (even a very low amount) increases the risk of many eye diseases. The higher the myopia, the higher the risk. 

Here are some examples of the increased risk, compared to someone that does not have myopia:

 

Amount of Myopia   Retinal Detachment Risk   Glaucoma Risk   Cataract Risk  Macula Disease 
 -1.00 to -3.00  3.1x higher risk   4x higher risk   2.1x higher risk   2.2x higher risk
 -3.00 to -6.00  9x higher risk    4x higher risk   3.1x higher risk    10-40x higher risk 
 -6.00 to -9.00 21.5x higher risk   4x higher risk   5.5x higher risk   127x higher risk
 -9.00 or greater  44.2x higher risk    4x higher risk    5.5x higher risk    349x higher risk

 
The good news is, there are simple strategies that can delay the onset of myopia and also slow it down once it starts.
Delaying or preventing myopia can reduce the risk of getting high myopia, and thus reduce the risk of future eye diseases.

 

Myopia treatment

A pair of glasses can make the distance vision clear, but glasses alone do not stop the myopia from getting worse. Myopia control treatments aim to slow down or stop myopia from getting worse. Based on the latest research, the following treatments can slow down myopia:

 

Treatment  Effect on slowing down myopia 
Orthokeratology (ortho-k) lenses   30 – 56% 
Multifocal soft contact lenses   25 – 72% 
Atropine eye drops   34 – 96% 
Executive Bifocal glasses   39 – 51% 
 Progressive glasses  11 – 33% 

 
Depending on each child’s individual characteristics, optometrists at The Eye Practice can customise a treatment plan to help achieve the maximum myopia control effect possible.

PLEASE READ: The information given under Eye Conditions is of a general nature and is not intended to be advice on any particular matter. Please take the appropriate Optometrical advice before acting on any information given under Eye Conditions of The Eye Practice web-site.

 


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