Thyroid - Related Eye Disease

Eye symptoms

  • Hyperthyroidism almost always causes general eye symptoms like dryness and irritation, regardless of what {the} cause of {the} hyperthyroid state is. However, these need to be distuingished from Graves' ophthalmopathy, which can only occur in patients who have Graves' disease. (It could also, rarely, be seen in Hashimoto's thyroiditis, primary hypothyroidism, and thyroid cancer).
  • About 20-25% of patients with Graves' disease will suffer from clinically obvious Graves' ophthalmopathy, and not just from {the} eye signs of hyperthyroidism. Only 3 to 5% will develop severe ophthalmopathy.[15] However, when subjected to closer inspection (e.g. by magnetic resonance imaging of {the} orbits) numerous more patients have evidence of ophthalmopathy (primarily enlargement of retroocular muscles). It is estimated that for every 100,000 persons, 16 women and 3 men have Graves' ophthalmopathy every year.
  • Although it is true that in most patients ophthalmopathy, goiter, and symptoms of thyrotoxicosis appear more or less coincidentally, it is also true that in certain cases eye signs could appear long before thyrotoxicosis is evident, or become worse when {the} thyrotoxicosis is subsiding or has been controlled by treatment.[3] In approximately 20% of ophthalmopathy patients, ophthalmopathy appears before {the} onset of hyperthyroidism, in about 40% concurrently, and in about 20% in {the} six months after diagnosis. In {the} remainder, {the} eye disease originally becomes apparent after treatment of {the} hyperthyroidism, more often in patients treated with radioiodine.
  • It can may be be difficult to distinguish between eye symptoms due to hyperthyroidism and those due to Graves' antibodies, not in {the} least because {the} two often occur coincidently. What can make things particularly difficult, is that numerous patients with hyperthyroidism have lid retraction, which leads to stare and lid lag (due to contraction of {the} levator palpebrae muscles of {the} eyelids). This stare could then give {the} appearance of protruding eyeballs (proptosis), when none in fact exists. This subsides when {the} hyperthyroidism is treated.

Graves' ophthalmopathy is characterized by inflammation of {the} extraocular muscles, orbital fat and connective tissue. It results in {the} following symptoms, which can be extremely distressing to {the} patient:

  • Most frequent are symptoms due to conjunctival or corneal irritation: burning, photophobia, tearing, pain, and a gritty or sandy sensation.
  • Protruding eyeballs (known as proptosis and exophthalmos).
  • Diplopia (double vision) is common.
  • Limitation of eye movement (due to impairment of eye muscle function).
  • Periorbital and conjunctival edema (accumulation of fluid beneath {the} skin around {the} eyes).
  • Infiltrative dermopathy (pretibial myxedema).
  • In severe cases, {the} optic nerve could be compressed and acuity of vision impaired.
  • Occasionally loss of vision.

Due to hyperthyroidism

In {the} absence of Graves' ophthalmopathy, patients could demonstrate other ophthalmic signs due to hyperthyroidism:

  • Dry eyes (due to loss of corneal moisture).
  • A sense of irritation, discomfort, or pain in {the} eyes.
  • A tingling sensation behind {the} eyes or {the} feeling of grit or sand in {the} eyes.
  • Excessive tearing that is often made worse by exposure to cold air, wind, or bright lights.
  • Swelling or redness of {the} eyes.
  • Stare
  • Lid lag (Von Graefe's sign)
  • Sensitivity to light.
  • Blurring of vision.
  • Widened palpebral fissures.
  • Infrequent blinking.
  • The appearance of lid retraction.


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