Pathological Myopic Retinopathy & Myopic Maculopathy
Degenerative chorioretinal thinning and staphyloma formation resulting from excessive axial globe elongation in severe high myopia (>-6.00 D).
Article Table of Contents
1. Comprehensive Overview
Pathological Myopia (Degenerative Myopia) is defined as high myopia (spherical equivalent > -6.00 D or axial length > 26.0 mm) associated with structural degenerative changes in the sclera, choroid, RPE, and neurosensory retina.
Pathophysiology: Progressive mechanical elongation of the posterior eye wall thins the chorioretinal layers, leading to characteristic pathological entities:
Pathognomonic Manifestations: 1. Posterior Staphyloma: Outpouching of the posterior scleral wall, the hallmark of pathological myopia. 2. Lacquer Cracks: Mechanical linear ruptures in Bruch's membrane across the macula. 3. Myopic Choroidal Neovascularization (Myopic CNVM / Foster-Fuchs Spot): Subretinal neovascular growth through lacquer cracks causing sudden central hemorrhage and dark pigmented macular scarring. 4. Peripheral Lattice Degeneration and Atrophic Holes with elevated retinal detachment risk. 5. Myopic Traction Maculopathy (MTM), foveoschisis, and full-thickness macular holes.
2. Symptoms & Warning Signs
If you observe any of the following symptoms repeatedly, an eye exam is strongly recommended:
- Reduced best-corrected visual acuity not fully compensable with updated spectacle lenses
- Sudden onset of metamorphopsia (wavy linear distortion from myopic CNVM)
- Central scotoma or gray shadow directly in the center of vision
- Prominent, dense vitreous floaters and flashing lights (photopsia) in the periphery
- Impaired contrast sensitivity and poor dark adaptation
3. Causes & Risk Factors
- 1Genetic susceptibility promoting excessive axial globe elongation (>26.0 mm)
- 2Biomechanical scleral collagen degradation and posterior scleral thinning
- 3Extreme refractive error (-6.00 D to -20.00 D or higher)
4. Treatments & Medical Management
5. Prevention & Daily Eye Care Advice
- Mandatory annual dilated fundus surveillance for all individuals with myopia > -5.00 D
- Avoiding severe high-impact collision sports, bungee jumping, and head-jarring trauma
- Immediate emergency evaluation within 24 hours of developing new flashes or floaters
- Promoting daily outdoor natural daylight exposure (2 hours/day) in children to retard axial globe elongation
6. When to Seek Emergency Eye Care
Visit an immediate eye emergency center if you experience any of the following critical indicators:
- ⚠Sudden wavy distortion of lines (metamorphopsia) in a high myope (warning sign of myopic CNVM)
- ⚠New central blind spot or reading difficulty
- ⚠New onset of light flashes (photopsia) or shower of floaters
- ⚠Perception of a dark peripheral veil or curtain (retinal detachment alert)
7. Frequently Asked Questions
Q:Does LASIK eliminate the retinal risks of high myopia?
No. LASIK reshapes the anterior cornea to eliminate eyeglasses, but does not alter the elongated axial length or thinned peripheral retina. Patients who undergo laser vision correction still carry the exact same lifelong retinal detachment and maculopathy risks, requiring annual dilated fundus exams.