1. Local causes

 *A. Acne rosacea
 B. Chronic congestive glaucoma
 C. Delayed mustard gas keratitis
 D. Idiopathic anomaly
 E. Irradiation of the eye
 F. Long-standing ocular inflammation
 *G. Metastatic primary tumor
 *H. Pterygium
 *I. Underlying choroidal or ciliary body melanomas

2. Systemic causes

 A. Acquired immunodeficiency syndrome (AIDS)
 B. Arteriosclerosis
 C. Associated with familial amyloidotic polyneuropathy, type 1
 D. Ataxic telangiectasia (Louis-Bar syndrome)
 *E. Degos syndrome (malignant atrophic papulosis)
 F. Diabetes
 G. Dysproteinemia as in Waldenström macroglobulinemia, cryoglobulinemia, and  multiple myeloma
 H. Endangiitis obliterans
 I. Fabry disease (diffuse angiokeratosis)
 J. Hereditary hemorrhagic telangiectasia (Rendu-Osler-Weber disease)
 K. Hypertension
 L. Klippel-Trenaunay-Weber syndrome (angioosteohypertrophy syndrome)
 M. Normal individuals
 *N. Pulmonary insufficiency
 O. Reimann syndrome (hyperviscosity syndrome)
 P. Renal failure
 Q. Rheumatic fever or rheumatic heart disease
 R. Scleroderma (progressive systemic sclerosis)
 S. Sturge-Weber syndrome (meningocutaneous syndrome)
 *T. Syphilis (acquired lues)
 U. Varicose veins-generalized

Ando E, et al. Ocular microangiopathy in familial amyloidotic polyneuropathy, type 1. Graefes Arch Clin Exp Ophthalmol 1992; 230:1-5.

Baumann S, et al. Conjunctival microvasculopathy and Kaposi's sarcoma in patients with AIDS. AIDS 1994; 8: 134-135.

Roy FH. Ocular syndromes and systemic diseases, 3rd ed. Philadelphia: Lippincott Williams & Wilkins, 2002.