Shanghai Jiahui Optical Instrument Co.,Ltd
  • Shanghai Jiahui Optical Instrument Co.,Ltd
  • Register
  • Login

+86 15001978117 jiahe@jhoptical.com

Facebook
Twitter
Youtube
LinkedIn
Pinterest
Shanghai Jiahui Optical Instrument Co.,Ltd
  • Home
  • Products
  • Articles
    • Optometry Articles
    • Product Articles
  • Download
  • F.A.Q
  • Feedback
  • About us
  • Contact us

Optometry Articles

Home Articles Optometry Articles Myopia prevention and control (Myopia-Ne...

Myopia prevention and control (Myopia-Nearsightedness)

Article from: DINGXIANGYUAN forum




Myopia-Nearsightedness

Nearsightedness, or myopia, as it is medically termed, is a vision condition in which people can see close objects clearly, but objects farther away appear blurred. People with myopia can have difficulty clearly seeing a movie or TV screen, a whiteboard in school or while driving.



Myopia (nearsightedness) is a refractive error. Refractive error is when the eye does not bend (refract) light properly. Light does not focus correctly so images are not clear. In myopia, close objects look clear but distant objects appear blurred. Myopia is a common condition . It is an eye focusing disorder, not an eye disease.


The eye's tear film, cornea and lens bend light so it focuses on the retina. The retina receives the picture formed by these light rays. It sends the picture to the brain through the optic nerve. Myopia occurs if the eyeball is too long or the cornea (the clear front cover of the eye) is too curved. As a result, light rays focus in front of the retina instead of on it. In this case, you see near objects clearly, but distant objects will appear blurred.



While the exact cause of myopia is unknown, there is significant evidence that many people inherit myopia, or at least the tendency to develop myopia. If one or both parents are nearsighted, there is an increased chance their children will be nearsighted.


Even though the tendency to develop myopia may be inherited, its actual development may be affected by how a person uses his or her eyes. Individuals who spend considerable time reading, working at a computer, or doing other intense close visual work may be more likely to develop myopia.


Generally, myopia first occurs in school-age children. Because the eye continues to grow during childhood, it typically progresses until about age 20. Myopia is often discovered in children when they are between ages 8 and 12 years old. During the teenage years, when the body grows rapidly, myopia may become worse. However, myopia may also develop in adults due to visual stress or health conditions such as diabetes.



If the myopia is mild, ophthalmologists call this low myopia. They call severe myopia high myopia. High myopia will usually stabilize between the ages of 20-30 years old. Usually, you can correct high myopia with glasses or contact lenses. Sometimes, refractive surgery can correct high myopia.


Myopia may also occur due to environmental factors or other health problems:


1、Some people may experience blurred distance vision only at night. With "night myopia," low light makes it difficult for the eyes to focus properly. Or the increased pupil size during dark conditions allows more peripheral, unfocused light rays to enter the eye.


2、People who do an excessive amount of near-vision work may experience a false or "pseudo" myopia. Their blurred distance vision is caused by overuse of the eyes' focusing mechanism. After long periods of near work, their eyes are unable to refocus to see clearly in the distance. Clear distance vision usually returns after resting the eyes. However, constant visual stress may lead to a permanent reduction in distance vision over time.


3、Symptoms of myopia may also be a sign of variations in blood sugar levels in people with diabetes or may be an early indication of a developing cataract.


A doctor of optometry can determine the cause of the vision problems through a comprehensive eye exam.


People with myopia have a higher risk of developing a detached retina. Ask your ophthalmologist to discuss the warning signs of retinal detachment with you. See your ophthalmologist regularly to watch for changes in the retina that might lead to retinal detachment. A surgery can usually repair the retina if you discover the detachment early enough.

People with high myopia may also have a higher risk of developing glaucoma and cataracts.

Myopia(Nearsightedness) Symptoms: Some of the signs and symptoms of myopia include: eyestrain,headaches,squinting to see properly,and difficulty seeing objects far away. These symptoms may become more obvious when children are between ages 8 and 12 years old.


Related News

What is the hyperopia reserve?

What is the hyperopia reserve?

What are progressive multifocal lenses?

What are progressive multifocal lenses?

Astigmatism(Theory,Pathophysiology)

Astigmatism(Theory,Pathophysiology)

What equipments are need if open an optical shop?

What equipments are need if open an optical shop?

Beware of adolescent myopia control progressive lens

Beware of adolescent myopia control progressive lens

Myopia prevention and control (Myopia-Nearsightedness)

Myopia prevention and control (Myopia-Nearsightedness)

Articles

  • Optometry Articles
  • Product Articles

Category

  • Optometry Equipment
    • Auto Ref/Keratometer
      • Auto Refractometer/ Keratometer
      • Auto Focus Refractometer/ keratometer
    • Chart Projector | Chart Vision
    • Cross Cylinder | Flipper | Prism
    • Color Deficiency Test Card
    • Optometry Chairs
    • Optometry Electric Table
    • Near Chart Vision
    • Occluder | Red-green Frame
    • Refraction Chair Unit
    • Optometry Practice Eye
    • Phoroptor Stands
    • Phoropter
    • PD Meter
    • Trial Frame
    • Trial Lens Set
    • Visual Chart Light Box
  • Medical Ophthalmic Instruments
    • Corneal Topography
    • Digital Portable Slit Lamp
    • Eyepiece Adapter
    • Exophthalmometer
    • Fundus(Retinal) Camera/FFA
    • Keratometer
    • Laser Ophthalmology
    • Operation Microscope
    • Ophthalmic Ultrasound
    • Ocular Surface Analyzer
    • Ophthalmoscope/Retinoscope
    • Phaco Emulsifier
    • Shadowless Operating Lamp
    • Slit Lamp Microscope
      • S Series Slit Lamp
      • BL Series Slit Lamp
      • YZ Series Slit Lamp
      • LS Series Slit Lamps
    • Surgical Instruments
    • Synoptophore
    • Tonometer
    • Visual Field Screener(Perimeter)
  • Lens Edging Equipment
    • Auto Lens Edger
    • Auto Lens Groover
    • Auto Lens Meter
    • Auto Lens Beveller
    • Centering Machine(Blocker)
    • Frame Warmer
    • Hand Lens Edger
    • Hand Lens Meter
    • Lens Cutter & Pattern Opener
    • Lens Drilling & Notch-Cutting
    • Lens Thinning Machines
    • Lens Polisher
    • Pattern Drilling Machine
    • Tint Bath | Tint Tool
    • Ultrasonic Cleaners
  • Optometry Combination
  • Eyeglasses Tools
    • Eyeglasses Pliers
    • Lens Measure Tools
    • Glasses Tool Set
    • Lens Tester
    • Nylon Thread
    • Glasses Accessory Kit | Tweezers
    • Job Tray | Storage Box
    • Screw Extractor | Other Tools
  • Glasses Cloth
  • Glasses Cases
  • Glasses Cords
    • Pearl glasses chains
    • Fabric Glasses Cords
    • Leather Glasses Cords
    • Metal Glasses Chain
    • Silicone Glasses Cords
    • String bead glasses chains
    • Acrylic glasses chains
  • Glasses display stands
  • Mirrors
  • Stock Glasses
    • Adult Optical Frames
      • β Titanium Optical Frames
      • Stainless steel optical frames
      • Sport TR90 Optical Frames
      • TR90 optical frames with blue block lenses
      • Metal alloy frames
      • Pure Acetate Optical Frames
      • Splicing Acetate frames
      • Aluminium magnesium optical frames
    • Adult Sunglasses
      • PC Polarized Sunglasses
      • Acetate Polarized Sunglasses.
      • TR90 Polarized Sunglasses.
      • Metal Alloy Sunglasses
      • Aluminium Magnesium Polarized Sunglasses
      • Nylon Lens Sunglasses
    • Polarized clip set glasses
      • TR90 Polarized Clip on Set Glasses
      • Metal Alloy Polarized Clip on set glasses
      • Acetate polarized clip set glasses
    • Kid Sunglasses
      • Kid TPEE Polarized Sunglasses
      • Nylon Kid Polarized Sunglasses
      • Kid Acetate Polarized Sunglasses
      • Kid Nylon Lens Sunglasses
      • Kid photochormic polarized sunglasses
    • Kid Optical frames
      • Kid PPSU Optical Frames
      • Kid Removable Temple Optical Frames
      • Kid TR90 & TPU Optical Frames
      • Kid Acetate Optical Frames
      • Kid One-Piece Nylon Elastomer Optical Frames
      • Kid Polarized Set glasses
    • Reading glasses
    • Goggles
      • Swimming goggles
      • Ski Goggles
      • Tactical Goggles
      • Motorcross Goggles
      • Fire Goggles
      • Protective goggles
      • Pet Goggles
      • Golf Ball Seeking Glasses
  • Lenses
    • Un-Coating Lenses
    • HC Lenses
    • HMC Lenses
    • HMC+Blue AR Lenses
    • Blue Block Lenses
    • Blue Block+Blue Ar Lenses
    • Photochromic Lenses
    • Blue Block+Photochromic Grey & Brown
    • Photochromic Pink,Blue & Purple
    • Blue Block+Photochromic Pink,Blue & Purple
    • Photochromic+Blue block+Blue Ar Lenses
    • Dyed Lenses
    • Antil-Glare Lenses
    • Antifog Lenses
    • Polarized Sun Lenses
    • Flat Top Bifocal Lenses
    • Invisible Bifocal Lenses
    • Round Top Bifocal Lenses
    • Inner Progressive Lenses
    • Photochromic Inner Progressive Lenses
    • IOT Design Inner Progressive Lenses
    • Double-FreeForm Progressive Lenses
  • Low Vision Magnifiers
    • Cylinder Magnifier
    • Desktop Microscope
    • Foldable Magnifier
    • Glasses Type Magnifier
    • Handle Magnifier
    • Monocular Holding Magnifier
    • Paperweight Magnifier
    • Reticle Stand Magnifier
    • Telescopes
    • Torch Magnifier
  • Consumable Products
    • Sucker
    • Lens Pads
    • Polarizing cards
  • Accessories
    • Auto refractometer accessories
    • Lens edger accessories
    • Lens groover accessories
    • Lens meter accessories
    • Lens polisher accessories
    • Ophthalmoscope/ retinosocpe accessories
    • Operation microscopes accessories
    • Optometry table accessories
    • Phoropter accessories
    • Slit Lamp Accessories
    • Tonometer accessories
    • Lamps
  • Glasses Accessories
    • Glasses screws
    • Nose pads

Links

Yahoo! Google Bing Baidu.com jhoptical.com JH OPTICAL

Auto Phoroptor comb

LatestPost

  • What is my face shape, and how to choose glasses for your face shape
    What is my face shape, and how to choose
    2016-05-02 13:03
  • Myopia prevention and control (Myopia-Nearsightedness)
    Myopia prevention and control (Myopia-Ne
    2016-05-02 00:00
  • Astigmatism(Theory,Pathophysiology)
    Astigmatism(Theory,Pathophysiology)
    2016-05-02 00:00
  • Forwarding cataract FAQ, need to give patients popular science to use
    Forwarding cataract FAQ, need to give pa
    2016-05-02 00:00

Feedback

Contact Us

2914913612

008613818330937

jiahe@jhoptical.com

yiyang.li.cn

Rm316, Building 6, #1018 Shiwan No.7 Rd. Pudong, Shanghai, China

MOBILE WEBSITE

Copyright © 2022 Jiahui Optical All Rights Reserved.

  • Skype.
  • E-mail
  • Whatsapp
  • Inquiry