Frequently Asked Questions/Myopia (view source)
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20/20 is a barn door. It’ll do, as far as determining a ballpark for your eyesight, and a means to figure out how much lens correction will give you the clearest possible vision. Consider this, the tool used by optometry, and it’s vaguest accuracy, before ‘blindly’ trusting the mainstream lens sales with your eyesight.}} | 20/20 is a barn door. It’ll do, as far as determining a ballpark for your eyesight, and a means to figure out how much lens correction will give you the clearest possible vision. Consider this, the tool used by optometry, and it’s vaguest accuracy, before ‘blindly’ trusting the mainstream lens sales with your eyesight.}} | ||
==What is axial elongation?== | ==What is axial elongation?== | ||
{{also|Frequently Asked Questions/Myopia/Quotes#Axial elongation}} | |||
[[Axial elongation]] is the increase in length of the eyeball. It happens when you wear glasses and look at screens for extended periods of time. Specifically, it happens due to [[hyperopic defocus]] as a result of [[close work]] combined with [[glasses]] that are [[overprescribed]] for the [[focal distance]] in question. | [[Axial elongation]] is the increase in length of the eyeball. It happens when you wear glasses and look at screens for extended periods of time. Specifically, it happens due to [[hyperopic defocus]] as a result of [[close work]] combined with [[glasses]] that are [[overprescribed]] for the [[focal distance]] in question. | ||
{{jake says|Axial elongation is the elongating of the eyeball. Speculation abounds as to the causes, though the most accepted is that axial elongation is just part of the whole story. Axial change, rather than axial elongation alone should be considered as a mechanism by which the eye compensates for focal plane error.}} | |||
[https://www.sciencedirect.com/science/article/pii/S0896627304004933 Homeostasis of Eye Growth and the Question of Myopia] | |||
===How do I tell if I see blurry because of axial elongation?=== | ===How do I tell if I see blurry because of axial elongation?=== | ||
Blog post: [https://endmyopia.org/pro-topic-ciliary-spasm-blur-vs-axial-elongation-blur/ Pro Topic: Ciliary Spasm Blur Vs. Axial Elongation Blur] | Blog post: [https://endmyopia.org/pro-topic-ciliary-spasm-blur-vs-axial-elongation-blur/ Pro Topic: Ciliary Spasm Blur Vs. Axial Elongation Blur] | ||
==How do I calculate all the diopter & optics maths?== | ==How do I calculate all the diopter & optics maths?== | ||
See [[optics related math]]. | See [[optics related math]]. | ||
==What is pseudomyopia?== | ==What is pseudomyopia?== | ||
[[Pseudomyopia]] is where the [[ciliary muscle]] locks up due to prolonged periods of [[close up]], typically spent in front of a monitor. Pseudomyopia is typically the condition people have when they first go to the optometrist to get a pair of glasses. That pair of glasses goes onto cause [[lens-induced myopia]]. | [[Pseudomyopia]] is where the [[ciliary muscle]] locks up due to prolonged periods of [[close up]], typically spent in front of a monitor. Pseudomyopia is typically the condition people have when they first go to the optometrist to get a pair of glasses. That pair of glasses goes onto cause [[lens-induced myopia]]. | ||
[[Wikipedia:Pseudomyopia|Wikipedia article on pseudomyopia]] | |||
{{jake says|Pseudo myopia or NITM (near induced transient myopia) is a vision deficiency caused by a focusing muscle spasm – generally from excessive close-up focus. | |||
It is referred to as “pseudo” myopia or “transient” myopia since it is just a muscle spasm. If you stop the strain activity, the muscle will eventually relax, and the myopia symptom will simply disappear. | |||
Problems arise when this early myopia is misdiagnosed and treated with lenses. | |||
From Wikipedia: | |||
''“'''Pseudomyopia''' refers to an intermittent and temporary shift in refraction of the eye towards myopia, in which the focusing of light in front of the retina is due to a transient spasm of the ciliary muscle causing an increase in the refractive power of the eye.”''}} | |||
===Does computer work cause pseudomyopia?=== | |||
{{also|Frequently Asked Questions/Myopia/Quotes#Pseudomyopia}} | |||
{{jake says|Maybe. Sort of. | |||
All myopia starts as “pseudo myopia”, also referred to as ciliary spasm myopia or NITM (near-induced transient myopia). | |||
This isn’t real myopia, in that it would just go away if you stopped the excessive close-up focus. A whole lot of computer work, every day, never stopping that strain, does cause pseudo myopia. This can show up to be anywhere from 1 to 1.5 diopters at an optometrist exam. | |||
Computer work alone (or reading books, or any other consistent close-up focus) doesn’t cause myopia higher than 1.5 diopters of optometrist diagnosed correction. It’s not until you begin to wear glasses, that real myopia happens (lens-induced, axial elongation myopia). }} | |||
==Why is my eyesight worse indoors or in low light?== | ==Why is my eyesight worse indoors or in low light?== | ||
[https://endmyopia.org/why-is-my-eyesight-worse-in-low-light-indoors-dusk-night-time/ See this blog post] | [https://endmyopia.org/why-is-my-eyesight-worse-in-low-light-indoors-dusk-night-time/ See this blog post] | ||
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===Is myopia genetic/hereditary?=== | ===Is myopia genetic/hereditary?=== | ||
{{also|Frequently Asked Questions/Myopia/Quotes#Hereditary factors of myopia}} | |||
[[File:Double_D_Facts_about_Myopia.png|350px|right]] | [[File:Double_D_Facts_about_Myopia.png|350px|right]] | ||
No, in the majority of cases. The majority of myopia is [[lens-induced]] in the world. Question why [[Wikipedia:natural selection]] has failed so terribly it's resulted in eye defects in huge swathes of the population, two billion in the world. | No, in the majority of cases. The majority of myopia is [[lens-induced]] in the world. Question why [[Wikipedia:natural selection]] has failed so terribly it's resulted in eye defects in huge swathes of the population, two billion in the world. | ||
The Ministry of Healh in Singapore says: {{xt| | The Ministry of Healh in Singapore says: {{xt|“The prevalence of myopia in Singapore is among the highest in the world, with 65 percent of our children being myopic by Primary 6, and 83 percent of young adults being myopic.”}}<ref>https://www.moh.gov.sg/news-highlights/details/speech-by-dr-lam-pin-min-senior-minister-of-state-for-health-at-the-opening-of-the-singapore-national-eye-centre-s-myopia-centre-16-august-2019#:~:text=2.,of%20young%20adults%20being%20myopic</ref> How did their ancestors survive to lead to the current generation if myopia is generally so disadvantageous to an organism's survival? | ||
{{clear}} | {{clear}} | ||
{{jake says|No. And yes. | |||
Myopia has two primary causes (or stages). Ciliary (focusing muscle) spasm, also referred to as pseudo myopia, or near-induced transient myopia. It then becomes lens-induced myopia if you start wearing glasses. | |||
The degree to which your myopia will increase with the second (lens-induced) stage, depends on genetics to some degree.}} | |||
===Is infant myopia normal?=== | ===Is infant myopia normal?=== | ||
{{also|Frequently Asked Questions/Myopia/Quotes#Infant myopia}} | |||
Most children are born [[hyperopic]] or [[myopic]]. Over the first few years, their eyes grow to be approximately [[emmetropic]], with least variability at about 6 years of age. | Most children are born [[hyperopic]] or [[myopic]]. Over the first few years, their eyes grow to be approximately [[emmetropic]], with least variability at about 6 years of age. | ||
===Do glasses make my eyes worse?=== | ===Do glasses make my eyes worse?=== | ||
{{also|Frequently Asked Questions/Myopia/Quotes#Glasses progressing myopia via hyperopic defocus}} | |||
'''Yes''', when the glasses are for distance and you perform excessive periods of [[close-up activity]]. | '''Yes''', when the glasses are for distance and you perform excessive periods of [[close-up activity]]. | ||
===What is form deprivation myopia?=== | ===What is form deprivation myopia?=== | ||
{{also|Frequently Asked Questions/Myopia/Quotes#Form deprivation}} | |||
Search for 'form deprivation' in this study: https://www.sciencedirect.com/science/article/pii/S0896627304004933 | |||
==Potential solutions to myopia== | ==Potential solutions to myopia== | ||
===Does outdoor time reduce myopia?=== | ===Does outdoor time reduce myopia?=== | ||