Eyelids & Eyelashes Flashcards
(116 cards)
label the diagram


What are the dimensions for eyelids? (Vertical, Horizontal, Canthus angle, upperlid (children, lower lid)
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Vertical:
- 10-11mm young adult
- 8-10mm mature adult
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Horizontal
- 30-31mm
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Canthus angle
- ~30^ nasally & temporally
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Upper lid at superior corneal limbus in children
- 1.5-2.0mm below limbus in adults
- Lower lid at inferior limbus
What are the function for eyelids?
- Protective barrier from foreign material (lashes move airborne particles away from the eye)
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Prevents desiccation
- Secretes elements of the tear film
- Blinking functions
- Tears move from lateral canthus -> medial canthus
- Zipper-like closure
- Decrease amt of light entering the eye
Describe the anatomy of the lids. (label orbital septum & tarsal plate in the diagram)

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Skin
- Epidermis
- Dermis
- Skin appendages
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Orbital septum
- Fibrous membrane that separates the eyelids from anterior rim of the orbit
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Tarsal plate
- Rigidity & structure

Describe the anatomy of the cilia & lashes

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Caruncle
- Hair
- Sebaceous gland (Zeis)
- Sweat/sudor glands (Moll)
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Plica semiluminaris - vestigial remnant
- Loose, allows for lateral eye mvmt
- Does not stretch conjunctiva
- Tear drainage

Musculature for lids (label orbicularis oculi muscle, superior tarsal muscle, aponeurosis of levator muscle, and riolans muscle in the diagram)

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Orbicularis oculi
- Voluntary & involuntary control
- Gentle lid closure (sleep)
- Pulls tears through lacrimal sac
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Riolan’s Muscle
- Ciliary portion of orbicularis
- Holds lids against globe
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Levator superioris aponeurosis
- Elevate & retract upper lid
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Muller’s muscle
- Elevate & retract upper lid

Innervation

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CN VII - Facial nerve
- Temporal branch
- Zygomatic branch
- MOTOR control of orbicularis
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CN V - Trigeminal nerve
- Ophthalmic division
- Maxillary division
- SENSORY
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CN III - Oculomotor nerve
- superior division
- MOTOR control of levator
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Sympathetic nerves
- Innervates Muller’s muscle
Vascular supply

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Arteries
- Facial artery
- Superficial temporal artery
- Infraorbital artery
- Angular artery
- Lacrimal artery
- Supratrochlear artery
- Zygomaticofacial artery
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Veins
- Facial vein
- Angular vein
- Superior opthalmic vein
- Supraorbital vein

Eyelids: Lymphatic drainage
- Anterior to orbital septum
- All drain inferiorly
- Deep & superficial parotid nodes/ submandibular nodes
- Lateral 2/3 or upper lid
- Lateral 1/3 of lower lid
- Anterior cervical nodes - Deep & superficial
- Medial 1/3 of upper lid
- Medial 2/3 of lower lid
Name the congenital malformations
- Ablepharon
- Microblepharon
- Ankyloblepharon
- Eyelid coloboma
- Epicanthus
Ablepharon

Ablepharon (A = absence; Belpharon=Eyelid)
- Failure of lid formation
- Globe is always exposed
- Association with abelpharon-macrostomia syndrome (rare inherited disorders)
- Macrostomia - wide, fish-like mouth
- Absence of eyelashes/brows
- Incompletely developed, low-set ears
- Abnormally sparse, thin hair
- Thin, wrinkled skin
- Webbed fingers
- Malformations of external genitalia
Microblepharon

Microblepharon
- Lid formation too small for normal lid function (shortening of lid)
- often associated with anophthalmos (absence of eye)
Ankyloblepharon

Ankyloblepharon
- Fusion of lids to eachother via small/thin skin tag
- May be single or multiple
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Associations
- Isolated congenital defect (Congenital glaucoma)
- Ankyloblepharon Filiforme Adnatum (AFA) (Cleft palate)
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Treatment
- Band retraction
- Monitor for other conditions
Eyelid coloboma

Eyelid Coloboma
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Cleft in lid caused by incomplete closure of embyronic tissue
- 90% occur on upper lid
- typically forms at junction of middle & medial 1/3 of lid
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Associations
- Dermoids: normal tissue that forms in an abnormal position
- Strabismus: have exo that develops
- Corneal opacities
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Implications
- Exposure
- Amblyopia: May be due to exposure & strabismus
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Treatment
- Lubrication
- Bandage
- Surgery
Epicanthus

Epicanthus
- Extra fold of skin
- May cover inner canthus
- Do Hirschberg test to confirm
List the Eyelid Malposition
Ptosis
Dermatochalasis
Ectropion
Entropion
Lagophthalmos
Floppy eyelid syndrome
Symblepharon
List symptoms, etiology, & examination

Ptosis
- Drooping of eyelid
- If lower lid comes up = lower lid ptosis
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Symptoms
- Asymmetry
- Lid sagging
- Brow ache (Pt holding lids up)
- Loss of superior VF
- Loss/decrease of depth perception
- Vision loss/amblyopia development
- Cosmesis
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Etiology
- Aponeurotic = Defect in levator aponeurosis MOST COMMON
- Mechanical = gravitational effect of a mass/scarring
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Myogenic (Muscular)
- Myopathy of levator
- Myasthenia gravis
- Muscular dystrophy
- Chronic progressive external ophthalmoplegia = Kearns-Sayre Syndrome
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Neurogenic
- Innervational defect
- CN III Palsy
- Horner’s Syndrome
- Marcus Gunn jaw winking
- Pseudoptosis
- Congenital
- Pharmacologic
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Examination
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Margin to corneal reflex measurment
- MRDI: Corneal reflex to upper lid
- MRD2: Cornea reflex to lower lid
- Palpebral fissure measurement: Distance between upper lid & lower lid primary gaze
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Levator fxn measurement
- Normal => 15mm, Good 12-14mm, Fair 5-11 mm; Poor <4mm
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Upper lid crease position: Vertical distance b/w lid margin & lid crease in downgaze
- Female ~10mm; Male~8mm
- Pretarsal show: Distance b/w lid margin& skin fold in primary gaze
- Fatigability: Activites to tire muscles
- Ocular motility defects: Look for CN palsies
- Bell phenomenon: Up & out rotation w/ eyes closed
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Hering’s Law: Equal innervation of lids
- Fellow lid may be elevated in compensation
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Margin to corneal reflex measurment
Ptosis Examination
- Margin to corneal reflex measurement: measurement of corneal light reflex to lid margin in PRIMARY gaze
- Palpebral fissure measurement distance between upper & lower lid in primary gaze
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Levator fxn measurement
- Normal = 15mm
- Good = 12-14mm
- Fair = 5-11mm
- Poor = <4mm
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Upper lid crease position: vertical distance between lid margin & lid crease in DOWNGAZE
- Female ~10mm; Male ~8mm
- Pretarsal show Distance between lid margin & skin fold in PRIMARY gaze
- Fatigability Activities to tire muscles
- Ocular motility defect look for CN palsies
- Bell phenomenon Up & out rotation of globe with closing of the eyes
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Hering’s Law Equal innervation of lids
- Fellow lid may be elevated in compensation
Name the characteristics & causes of aponeurotic ptosis

Ptosis - Aponeurotic (MOST COMMON of ptosis for ALL PT)
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Characteristics
- High eyelid crease
- Moderate ptosis
- Good levator fxn
- Worsens in downgaze
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Causes
- Aging (most common cause), usually bilateral
- Repetitive eye rubbing
- RGP wear
- Previous intraocular surgery
- Muller fatigue
- Pregnancy
- Lid swelling
Mechanical ptosis

Ptosis - Mechanical
- Appearance depends on etiology
- inability of eye to elevate fully b/c of something else (tumor, mass, scarring)
- Gravitation effect of a mass or scarring
- CL in upper fornix
- Upper lid inflammation
- Chalazion, GPS, post-traumatic/surgical
- Neoplasm (abnormal mass of tissue may/may not be cancerous)
- Scar tissue
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Treatment
- get rid of whatever is causing it
- Ex. if its CL - take it out or if it’s swelling it can lead to aponeurotic ptosis
- Anterior Orbital lesions
Myogenic Ptosis

Ptosis - Myogenic (muscle related) characteristics
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Poor or absent lid crease
- Dysgenesis of levator, fibrosis & replacement w/ adipose tissue
- Poor Bell phenomenon
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Lagophthalmos on downgaze (when looking down, unable to fully close their lids
- Poor levator relaxation
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Up-gaze limitation
- Associated w/SR weakness
- Compensatory chin elevation
- Can either be congenital or acquired
Myogenic Congenital ptosis

Ptosis - Myogenic Congenital
- Common in children
- Unilateral or Bilateral
- Myopathy of levator leading to poor function
- Impairment of transmision of impulses at NMJ (neuromyopathic)
Myogenic Acquired Ptosis

Ptosis - Myogenic Acquired
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Uncommon
- Pt usually older - developed later in life
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Localized or diffuse muscular disease
- Muscular dystrophy
- CPEO - Chronic progressive external opthalmoplegia
- Myasthenia gravis
- Oculopharyngeal dystrophy
Myasthenia Gravis
(Define, Complications, Diagnosis, Tx)

- Autoimmune disease characterized by loss of ach receptor causing muscle fatigability & weakness
- Has both myogenic & neurogenic components in ptosis
- Female 2:1
- Age of onset: 20-50
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Ocular complications presenting signs in 2/3rd pt
- ptosis
- Diplopia
- Nystagmus
- Worsen w/fatigue
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Complications
- Difficulty chewing/swallowing
- Altered speech
- Difficutly breathing
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Diagnosis
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Tensilon Test
- Edrophonium - fast acting, short duration of Ach
- Improvement in ptosis - following injection
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Ice-pack test
- Ice pack applied to upper lid x 10 mins
- Positive test - impovement in ptosis by >2mm
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Fatiguing activities
- Walking up stairs
- Stand on toes
- Prolonged up-gaze
- increase in ptosis w/ fatigue is positive
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Repetitive nerve stimulation testing
- Lab testing: Serum anti-Ach receptor antibody titer or serum anti-musclespecific kinase titer
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Tensilon Test
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Tx
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Medical therapy:
- Acetylcholinesterase inhibitors
- Pyridostigimine (Mestinon)
- Oral steroids
- Immunomodulators
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Surgery
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Thymectomy
- 60% have thymic hyperplasia (thymoma)
- 10% thymic tumor
- B-cells interact w/ T-helper cells -> anti-Ach receptor antibodies
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Thymectomy
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Medical therapy:



































































