Orris

What are the pathological reasons someone develops myopia

Reading File
Finding Sources
Searching PubMed

myopia AND pathogenesis

Searching the Web

myopia causes pathogenesis axial elongation National Eye Institute

Reading File
Reading File
Reading Web Page

https://www.nei.nih.gov/research-and-training/research-news/…

Myopia, or nearsightedness, develops when the eye’s optical power is too strong for its length, so light from distant objects focuses in front of the retina instead of directly on it.

The main pathological mechanisms

  1. Axial myopia: the eyeball grows too long
    • This is by far the most common mechanism, especially in childhood-onset myopia.
    • The eye elongates from front to back, moving the retina behind the focal point.
    • In high/pathologic myopia, this elongation is progressive and is associated with remodeling and weakening of the posterior sclera, the tough outer coat of the eye.
  2. Refractive myopia: the cornea or lens bends light too strongly
    • A cornea that is too steep or a crystalline lens that is too powerful can focus light too soon.
    • This can occur with corneal ectasia such as keratoconus, or with lens-related changes.
  3. Lens swelling or displacement causing acquired myopia
    • Rapid-onset myopia can result from changes in the lens, for example:
      • hyperglycemia in diabetes, causing lens hydration/swelling
      • early cataract, especially nuclear sclerosis
      • trauma
      • some medicines, including sulfonamide-related drugs, which can produce temporary ciliary-body/lens changes.
    • Sudden myopia in adulthood therefore deserves an eye examination rather than being assumed to be ordinary progression.

Why the eye elongates

Myopia is multifactorial:
  • Genetic susceptibility: myopia, particularly high myopia, clusters in families. Genes influence eye growth, scleral structure, and retinal signaling.
  • Visual-environment factors: intensive near work and education are associated with increased risk. The link with near work is less consistent across studies than the protective association of outdoor exposure.
  • Too little outdoor time: greater outdoor time lowers the risk that children will develop myopia. One proposed mechanism is brighter light stimulating retinal dopamine signaling, which may restrain excessive axial eye growth. The mechanism is still not fully settled.
The National Eye Institute explanation describes the basic optical problem and the proposed role of outdoor light. The American Academy of Ophthalmology statement summarizes the genetic and environmental contributors.

What makes myopia “pathologic” or degenerative?

Pathologic myopia is not simply a high glasses prescription. It involves progressive axial elongation, usually with posterior scleral thinning and weakening. The back of the eye may bulge outward, called a posterior staphyloma. Mechanical stretching can damage the retina, retinal pigment epithelium, choroid, optic nerve region, and macula.
Potential consequences include:
  • myopic macular degeneration/atrophy
  • myopic choroidal neovascularization, abnormal vessels beneath the retina that can bleed
  • retinal tears and retinal detachment
  • macular holes or traction-related macular changes
  • increased glaucoma and cataract risk
In pathologic myopia, axial length can be markedly increased, and the stretching of posterior eye tissues drives much of the sight-threatening damage. Goldman-Cecil Medicine, p. 4121; Kanski's Clinical Ophthalmology, p. 630.
A recent review of biological mechanisms relevant to myopia control is indexed as PMID 42627050, though it focuses on atropine mechanisms rather than establishing a single cause of myopia.

I have minus one vision in both eyes . Then what can I do? So that it doesn't progress more and stays like that. Or when I get, uh, any operation like LASIK done, it stays like that and, uh, doesn't change, uh, o- on long term.

Reading File
Finding Sources
Searching PubMed

myopia control children

Searching the Web

American Academy Ophthalmology LASIK stable refraction 1 year myopia control children outdoor atropine orthokeratology

Searching the Web

site:fda.gov LASIK stable vision prescription 1 year 18 years risks regression

Finding Sources
At -1.00 diopter in both eyes, you have mild myopia. It is usually easily corrected with glasses or contact lenses. Whether it progresses mainly depends on your age and whether your prescription has been changing on yearly eye exams.

To reduce the chance of progression

These measures are most useful if you are still a child, teenager, or young adult whose prescription is changing:
  • Spend regular time outdoors, ideally around 2 hours daily when practical. Outdoor daylight is associated with less myopia onset and slower progression in children.
  • Avoid uninterrupted close work. For screens, reading, and studying, use the 20-20-20 habit: every 20 minutes, look about 20 feet away for 20 seconds. Keep reading/screen distance comfortable, roughly arm's length for a screen, and avoid using screens very close to the face.
  • Use good lighting and avoid long close-work sessions in dim light.
  • Get a refraction and eye examination every 6-12 months while it is changing. Ask the clinician to record both the prescription and, where available, axial length.
  • Do not intentionally under-correct your glasses. Wearing weaker glasses has not been shown to reliably prevent progression.
If progression is clear, an ophthalmologist or optometrist who provides myopia management can discuss treatments such as low-dose atropine, specialized myopia-control spectacle lenses, multifocal soft contact lenses, or overnight orthokeratology. These are mainly used for progressive myopia in children and adolescents. They slow progression, but do not guarantee that it will stop. The AAO myopia guidance supports outdoor time and notes that atropine, specialized lenses, and orthokeratology can help in some school-age children. Recent systematic reviews also support treatment options for pediatric progression, including PMID 39945354.

About LASIK

LASIK can remove or reduce your dependence on glasses by reshaping the cornea. It does not stop the eyeball from naturally elongating or otherwise change the biological tendency to myopia.
So:
  • If your myopia is still progressing, LASIK should generally be postponed.
  • You should have a stable prescription for at least 1 year, commonly meaning a change no greater than about 0.50 D over that year.
  • You also need a suitable cornea, adequate corneal thickness, no keratoconus or concerning topographic findings, and a full preoperative eye assessment.
  • Even after excellent LASIK results, you can later need glasses again because of residual regression, continued myopic change, or age-related near-vision loss (presbyopia, often beginning in the 40s).
For mild -1.00 D myopia, LASIK may be technically possible if you are an appropriate candidate, but it is elective. Glasses or contact lenses remain very safe options. Kanski's Clinical Ophthalmology states that refraction should be stable for at least one year before LASIK; FDA patient materials use a similar stability criterion, as shown in this FDA LASIK information.

Practical plan

  1. Wear the glasses/contact correction that lets you see comfortably.
  2. Get a baseline comprehensive eye exam and keep a copy of the prescription.
  3. Compare it after 6-12 months.
  4. If it changes by about 0.50 D or more per year, ask specifically for a myopia-control consultation.
  5. Consider LASIK only after the prescription has been stable, and after a corneal/topography assessment by a refractive surgeon.
Seek prompt eye care if you develop sudden blur, flashes, a sudden shower of floaters, or a curtain/shadow in vision.
This is a shared conversation. Sign in to Orris to start your own chat.