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List the ocular complications of uncontrolled diabetes mellitus.

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diabetes AND ocular complications

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diabetes eye complications retinopathy cataract glaucoma National Eye Institute

Ocular complications of uncontrolled diabetes mellitus include:
  1. Diabetic retinopathy - the commonest ocular complication
    • Non-proliferative diabetic retinopathy: microaneurysms, dot-blot hemorrhages, hard exudates, cotton-wool spots, retinal ischemia.
    • Proliferative diabetic retinopathy: retinal neovascularization, with risk of vitreous hemorrhage, tractional retinal detachment, and severe visual loss.
  2. Diabetic macular edema - leakage of fluid into the macula causing impaired central vision and blurring.
  3. Cataract - earlier onset and more rapid progression. Severe hyperglycemia can rarely produce a transient “snowflake” cataract.
  4. Glaucoma
    • Increased risk of primary open-angle glaucoma.
    • Neovascular glaucoma may occur in advanced proliferative retinopathy when abnormal vessels obstruct aqueous drainage.
  5. Transient refractive changes - fluctuating blood glucose changes lens hydration and refractive power, causing temporary blurred vision or shifting myopia/hyperopia.
  6. Corneal disease - reduced corneal sensitivity, recurrent erosions, delayed epithelial healing, persistent epithelial defects, and greater susceptibility to keratitis.
  7. Diabetic papillopathy and optic neuropathy - optic disc swelling or ischemic optic neuropathy, with visual impairment.
  8. Ocular motor cranial nerve palsies - ischemic third, fourth, or sixth cranial nerve palsy causing diplopia; a third-nerve palsy is often pupil-sparing.
  9. Pupillary abnormalities - reduced pupillary light response or dyskinetic pupils due to autonomic neuropathy.
  10. Increased risk of ocular infections and postoperative complications - including more severe infections and delayed healing after ocular surgery.
The most vision-threatening consequences are proliferative diabetic retinopathy, macular edema, vitreous hemorrhage, tractional retinal detachment, and neovascular glaucoma. The National Eye Institute overview also identifies diabetic retinopathy, macular edema, cataract, and glaucoma as the principal diabetic eye diseases.
Textbook support: Robbins & Kumar Basic Pathology; Harrison’s Principles of Internal Medicine 22E; The Washington Manual of Medical Therapeutics.

List seven top cause

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Seven major ocular complications of uncontrolled diabetes mellitus:
  1. Diabetic retinopathy
  2. Diabetic macular edema
  3. Cataract
  4. Glaucoma, especially neovascular glaucoma
  5. Transient refractive error causing blurred vision
  6. Corneal disease, such as reduced corneal sensation and delayed healing
  7. Cranial nerve palsy causing diplopia, especially third, fourth, or sixth nerve palsy

Classification of glaucoma

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glaucoma classification

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glaucoma classification primary secondary congenital open angle angle closure AAO

Classification of glaucoma

1. Primary glaucoma

Occurs without an identifiable associated ocular or systemic cause.
  • Primary open-angle glaucoma (POAG)
    • High-tension POAG
    • Normal-tension glaucoma
  • Primary angle-closure disease
    • Primary angle-closure suspect
    • Primary angle closure
    • Primary angle-closure glaucoma
  • Primary congenital glaucoma
  • Juvenile open-angle glaucoma

2. Secondary glaucoma

Occurs due to an identifiable ocular disease, systemic disorder, trauma, drug, or procedure. It may be:

A. Secondary open-angle glaucoma

  • Pseudoexfoliative glaucoma
  • Pigmentary glaucoma
  • Steroid-induced glaucoma
  • Uveitic glaucoma
  • Traumatic angle-recession glaucoma
  • Lens-particle glaucoma
  • Phacolytic glaucoma
  • Glaucoma due to intraocular tumor
  • Glaucoma following surgery or aphakia

B. Secondary angle-closure glaucoma

  • Neovascular glaucoma
  • Phacomorphic glaucoma
  • Phacolytic glaucoma with pupillary block
  • Uveitic glaucoma with posterior synechiae and iris bombe
  • Malignant glaucoma (aqueous misdirection)
  • Glaucoma due to lens dislocation, tumor, or retinopathy of prematurity

3. Developmental glaucoma

  • Primary congenital glaucoma
  • Glaucoma associated with developmental ocular anomalies, such as aniridia, Axenfeld-Rieger anomaly, Peters anomaly, and microcornea
  • Glaucoma associated with systemic syndromes, such as Sturge-Weber syndrome and neurofibromatosis
A simpler exam-oriented classification is: congenital/developmental, primary open-angle, primary angle-closure, and secondary glaucoma. The AAO classification overview recognizes primary, secondary, and childhood/developmental forms, while mechanisms may be open-angle or angle-closure.

Classification of glaucoma

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glaucoma classification

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glaucoma classifications primary open angle primary angle closure secondary congenital National Eye Institute

Classification of glaucoma

A. Primary glaucoma

No identifiable ocular or systemic cause.
  1. Primary congenital glaucoma
  2. Primary juvenile open-angle glaucoma
  3. Primary open-angle glaucoma
    • High-tension glaucoma
    • Normal-tension glaucoma
  4. Primary angle-closure glaucoma
    • Acute angle closure
    • Chronic angle closure

B. Secondary glaucoma

Occurs due to a known cause and may be either open-angle or angle-closure.
  • Inflammatory/uveitic
  • Traumatic - including angle-recession glaucoma
  • Lens-induced - phacomorphic, phacolytic, lens-particle glaucoma
  • Neovascular
  • Steroid-induced
  • Pseudoexfoliative
  • Pigmentary
  • Postoperative/aphakic
  • Due to intraocular tumor
Short exam classification:
  1. Congenital/developmental glaucoma
  2. Primary open-angle glaucoma
  3. Primary angle-closure glaucoma
  4. Secondary glaucoma
The NEI glaucoma types summary groups glaucoma broadly into primary and secondary types.
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