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DISCIFORM SCAR

Disciform scar is the final scar stage of wet AMD or other causes of choroidal neovascularization (CNV). It’s basically the eye’s “healing” response after a bleed under the macula, but the scar damages central vision.

What it is

  • Definition: A gray-white, disc-shaped fibrous scar under the retina in the macular area
  • Size: Usually 1-5 mm wide, right where you need sharp vision
  • Tissue: Made of fibrous tissue, blood vessels, and pigment after a CNV membrane closes off

How it forms

  1. CNV develops: Abnormal blood vessels from the choroid break through Bruch’s membrane into the subretinal space
  2. Leakage and bleeding: Those vessels are fragile. They leak fluid and blood under the macula
  3. Inflammation + scarring: Your body tries to heal the bleed. Fibroblasts lay down collagen and the CNV becomes fibrotic
  4. RPE disruption: Retinal pigment epithelium clumps or dies, leaving pigment changes around the scar
  5. End stage: Active leakage stops, but the scar remains. This whole process takes weeks to months

Main causes

  • Wet age-related macular degeneration: Most common cause. Seen in patients 60+
  • Pathologic myopia: Can also end in a disciform scar, but in younger myopes it’s often called a Fuchs spot
  • Ocular histoplasmosis: POHS can cause CNV and scarring
  • Trauma or inflammation: Any CNV that bleeds can end this way if untreated

Appearance on exam

  • Color: Gray-white to yellow-white central lesion
  • Shape: Round or oval, “disc” like
  • Surrounding changes: Pigment clumps, atrophy, or lipid deposits at the edges
  • Size: Correlates with how bad vision loss is. Larger = worse

Symptoms

  • Central vision loss: Permanent blur or blank spot in the middle of vision
  • Distortion first: Before scar forms, patients report wavy lines from fluid. After scarring, it’s replaced by a fixed blind spot
  • Peripheral vision stays: You won’t go completely blind. Side vision is normal
  • Contrast loss: Reading and faces are hard even if acuity isn’t terrible

Diagnosis

  • Dilated fundus exam: Doctor sees the pale elevated scar
  • OCT scan: Shows hyperreflective subretinal material, loss of outer retinal layers, RPE disruption
  • Fluorescein angiography: Early CNV leaks. Late disciform scar stains but doesn’t leak because vessels are closed
  • History: Patient usually describes sudden vision drop months earlier from a bleed

Treatment

  • No reversing the scar: Once formed, the tissue is fibrotic and vision doesn’t return
  • Goal is prevention: Anti-VEGF injections like Avastin, Eylea, Vabysmo treat active wet AMD before it scars
  • Too late if scarred: Injections don’t help a mature disciform scar
  • Low vision rehab: Magnifiers, better lighting, eccentric viewing training to use peripheral retina

Disciform scar vs Fuchs spot
Feature Disciform scar Fuchs spot
Main cause Wet AMD Myopic CNV
Age 60+ usually 30s-50s
Color Gray-white fibrous Dark pigmented
Eye shape Normal axial length Long, >26.5 mm
Bilaterality Second eye at risk in 4-7 years Second eye at risk in 30-35%
Prognosis

  • Vision: Usually 6/60 or worse if the scar is subfoveal. If it’s off center, vision may be 6/12 to 6/24
  • Stability: Scar doesn’t grow, but geographic atrophy can develop around it
  • Other eye: High risk of wet AMD in fellow eye. Regular monitoring with Amsler grid and OCT is key

Bottom line: A disciform scar is the “tombstone” of wet AMD. Modern anti-VEGF therapy has made them much less common because we can shut down CNV before it bleeds and scars. That’s why sudden distortion or vision drop needs an urgent retina check.

FUCH’S SPOT

Fuchs spot = Fuchs’ spot. It’s a pigmented scar in the macula caused by bleeding from choroidal neovascularization (CNV). Almost always seen in people with pathologic myopia.

What it is

  • Location: Center of the macula, the part of your retina used for sharp central vision
  • Appearance: Round or oval dark spot. Color ranges from gray-black to reddish-brown depending on how old it is
  • Cause: End result of a subretinal bleed that healed. The blood gets replaced by scar tissue + pigment

How it forms

  1. High myopia stretches the eye: Eyeball gets too long, >26.5 mm
  2. Bruch’s membrane cracks: Lacquer cracks develop from the stretching
  3. CNV grows: New, fragile blood vessels from the choroid grow through the cracks
  4. Bleeding occurs: Those vessels leak or burst, causing subretinal hemorrhage under the macula
  5. Scar formation: As blood clears over weeks to months, fibrovascular tissue + RPE hyperpigmentation forms. That’s the Fuchs spot

Who gets it

  • Pathologic myopia: Main group. Usually -6.00D or worse
  • Age: Typically 30s to 50s, younger than regular AMD
  • Other names: Sometimes called Forster-Fuchs’ spot. Not related to Fuchs’ endothelial dystrophy of the cornea

Symptoms

  • Central vision loss: Blur or a dark/empty spot right in the middle of vision
  • Distortion: Straight lines look bent or wavy before the scar fully forms
  • Scotoma: Once scarred, you’ll have a permanent blind spot in the center
  • Often unilateral first: Can happen in the other eye later if myopia is severe in both

Diagnosis

  • Dilated fundus exam: Doctor sees a pigmented macular lesion
  • OCT scan: Shows subretinal scar tissue and disrupted retinal layers
  • Fluorescein/ICG angiography: Used early to find active CNV before it scars. Once it’s a Fuchs spot, the vessels are usually inactive
  • History: Patient usually reports a prior episode of sudden central vision drop from the bleed

Treatment

  • No reversal: A true Fuchs spot is a scar. Vision in that exact spot doesn’t come back
  • Goal is prevention: Treat the CNV before it bleeds and scars
    • Anti-VEGF injections: Avastin, Lucentis, Eylea injected into the eye if active CNV is caught
    • Photodynamic therapy: Rarely used now, but was an option before anti-VEGF
  • Low vision aids: If central vision is lost, magnifiers and rehab help with daily tasks

Prognosis

  • Vision impact: Depends on size and location. A small spot off-center may leave 6/12 vision. One dead center can drop to 6/60 or worse
  • Other eye risk: 30-35% chance of CNV in the second eye within 8 years if you have high myopia
  • Stability: Once scarred, it usually doesn’t grow. But new CNV can form at the edge

Fuchs spot vs other macular scars
Condition Cause Age group
Fuchs spot Myopic CNV bleed 30s-50s, high myopes
Disciform scar AMD CNV 60+, non-myopes
Toxoplasmosis scar Infection Any age, often kids/young adults
Bottom line: Fuchs spot is the “tombstone” left after a myopic CNV bleed. The key is catching CNV early with regular OCT scans if you’re a high myope, because once the spot forms, central vision loss is permanent.