Evaluation of a Ptosis Patient

Ptosis (from Greek Ptosis or πτ?σις, to "fall") is a (drooping) of {the} upper or lower eyelid.


  • The drooping could be worse after being awake longer, when {the} individual's muscles are tired.
  • This condition is frequently called "lazy eye", but that term normally refers to amblyopia.
  • If severe enough and left untreated, {the} drooping eyelid can cause other conditions, such as amblyopia or astigmatism.
  • This is a photograph of a patient with severe bilateral ptosis (Ptosis is sometimes referred to as Blepharoptosis. It refers to an eyelid which is droopy. This could cause a loss of vision, especially while reading, headaches, and eyebrow strain.

When ptosis is asymmetrical (worse on one side) or unilateral, we must consider Hering's law of equal innervation

  • Hering's law of equal innervation proposes that conjugacy of saccades is due to innate connections in which {the} eye muscles responsible for each eye's movements ar innervated equally.
  • This theory is in contrast to {the} theory proposed by Von Helmholtz (1911) which states that conjugacy is a learned, coordinated response and that {the} movements of {the} eyes are individually controlled.
  • Thus, if we surgical repair (pull up) one eyelid, {the} OTHER eyelid could in fact become droopy.
  • As you slide {the} control from {the} left to {the} right, you will see {the} 'see-saw' effect of {the} ptosis as {the} RIGHT eyelid undergoes simulated elevation, and {the} left eyelid drops.
Evaluation of patients with moderate (or better levator function) could involve 2.5% phenyelphrine drops to assess {the} response.




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