Excess of crystalline accommodation and the concept of pause in the near work environment
The main cause of the appearance of myopia in children without genetic causes and symptoms related to any age.
I chose this topic because in these times, we all look at a display for fun or due to work, but unfortunately many times we do not have a perfect conduct, and most of the time we treat the effect and not the cause of the symptoms that we present.
What is the excess of the accommodation of the crystalline?
How does it manifest itself and from what causes does it appear?
Excess of the accommodation of the crystalline refers to the fatigue of the muscles that coordinate the crystalline, called the ciliary muscles or the ciliary processes. They act on the crystalline trees by changing their shape according to the distance we look at, helping us to see well at different distances (primary function of the crystalline). Without this accommodation of the crystalline, if they remain in the “relaxed” position, you will see well at distance but you will not see well close.
The excess of accommodation comes when we work for a longer period in the near environment, without taking breaks to relaxx the ciliary muscles.
In the first phase we will notice that after a long period of work (at least an hour but depending on age) we will have a foggy view in the first seconds when we look at a distance. This is due to the fatigue of the ciliary muscles, that no longer have the power to elongate the crystalline (to see well at distance), in a fraction of a second, how long it takes to move the gaze from the close environment to distance.
This excess, repeated it daily, leads over time to a constant symptomatology, and in some cases, especially in children, can lead to the development of myopia. – “Online School” – We need a blakboard to exercices our cilliary muscles, our brain, and get rid of myopia !
Why does the excess of accommodation manifest itself differently depending on the age?
In the table of crystalline accommodation, you will notice a decrease in the amplitude of accommodation with age, so if at 9 years you have an accommodation of about 20 diopters, at 45 years you will have only 3-4 diopters, hence the different manifestation of excess depending on age.
So, an adult who makes excesses of accommodation (works in the near eviroment without breaks made in time) will bear the related symptomatology (headaches, dizziness, etc. or increase in dioptric values, if he already has a myopia) and a young person, in addition to symptomatology, due to the high flexibility of the crystalline, can reach myopia.
Some dioptron type devices give higher negative values in the excesses of accommodation compared to the real diopter (which in some cases is 0.00 even if the dioptron reads -5.00 dpt., attention to the age / the accommodation power of the crystalline), and in some people’s cases, even cylindrical values that are not related to reality (the crystalline is deformed and visual acuity is low – a new chapter on the evolution of the crystalline and eyeballs in the next generations).
An adult with excess of accommodation:
- It has a corrected myopia – the dioptron values will be higher than the real ones.
- It has a corrected hyperopia – dioptron values will be lower than the real ones, even negative values, if hyperopia is small.
- It has no problems with remote vision – the dioptron values will be negative until about 50-60 years if the accommodative excess is high.
Myopia grows from excess accommodation (at any age up to about 60-65 years in certain cases) and with physiological growth in children(up to 22-23 years), regardless of whether it arises from excess or genetically inherited!
So, if myopia grows slowly (by 0.25 – 0.50 dpt./year) in an adult over 25 years of age, this is not a galloping myopia but only an increase in myopia from excess of crystalline accommodation.
Eye activity in the close work environment and the concept of break 20-20-20
Close work environment – any eye activity between 20cm and 1.2m (desktop, laptop, mobile, tablet, book…)
Optimum comfort in the near-working environment
- Why do I have to take breaks, when I work up-close?
- How long does it take and what is a break?
- At what time frame do I have to take these breaks?
- At what distance should I look from the display?