Lids 2 - common eyelid disorders and their management Flashcards
Eyelid (palpebral alpeture) facts:
• Medial canthus 1mm lower than lateral canthus
• Upper eyelid skinfold
• (eye closed) Upper eyelid skin crease due to insertion of levator aponeurosis
•Insertion of levator muscle skin fold+crease
- also inserts into tarsal plate: elevating eyelid
•Mullers muscle below levator, attaches to upper border of tarsal plate: Leads to horners syndrome if dysfunctional
• Fat pad above levator: gives fullness to upper lid, it can collapse into eyelid as we get older, giving baggy eyelid
•Eyelid in east asian people inserts lower into skin + fat pad is also lower than caucasian
Entropion types:
•Interning of eyelid
•Can either be congenital or acquired.
•Acquired:
- Senile
- Spastic
- Cicatricial
Involutional entropion:
• Most common, two causes :
• Retractors - laxity, dehiscence, disinsertion, Horizontal eyelid laxity
• Over-riding orbicularis
- Overriding of preseptal over pretarsal orbicularis during lid closure
- Weakness of lower lid retractors
Entropion symptoms:
•FB sensation
•Epiphora
•Constant irritations
•Recurrent infections
•Corneal abrasion causing marked photophobia
Management of entropion (non surgical)
•Ocular lubricants
• Antibiotic ointments for infection
• Eyelid taping is an effective temporary measure
•Botox injection to the lower eyelid can temporarily correct entropion
Surgical management of entropion
•Horizontal lid laxity
- Lid shortening/tendons
•Retractors muscle
- Everting sutures/plication
•Tarsus plate
- Everting sutures
•Orbicularis
- Transverse lid split
Eyelid everting sutures :
Sutures eyelids tight to help entropion where there is laxity issues
What is Cicatricial entropion?
•Normally caused by conjunctival contraction due to cicatrisation of conjunctiva
•Chemical injuries
•Inflammatory conditions
- Stevens-Johnsons etc
Cicatricial entropion - Treatment
•More challenging to treat
•Disease process need to be arrested
•Release of scar tissue and posterior lamellar graft often required (mucous membrane)
Spastic entropion Symptoms:
• Ocular irritation
• Secondary blepharospasm
• Botox may help
Ectropion - Classification
•Can either be Congenital or acquired
- Involutional
- Paralytic
- Mechanical
- Cicatricial
Involutional Ectropion
•Similar changes as for entropion
• Main difference is orbicularis - in entropion there is over-riding but not in ectropion.
• When lid margin begins to evert, conjunctiva begins to get exposed resulting in tarsus thickening further exacerbating ectropion.
Ectropion - Symptoms
• Asymptomatic
• Epiphora
• Exposed chronically irritated conjunctiva
• Eyelid skin changes
What laxity tests can be used for an involutional ectropion/entropion?
•Medial canthal tendon laxity test
- Pull the eyelid laterally and observe punctal migration
1-2mm migration - Normal
- Up to limbus - mild MCT laxity
- Limbus to pupil - mod laxity
- Beyond pupil - Severe MCT laxity
•Lateral canthal tendon laxity test
- Observe lateral canthal angle
(normally acute angle)
- Rounded canthus - LCT laxity
- Pull lid medially and observe lat canthal migration (normal <2mm)
Mechanical ectropion
• Eyelid tumours/lesions causing ectropion by their weight
• Treatment - removal of lesion +/- eyelid tightening
Paralytic ectropion
• VII nerve palsy
• Inadequate eyelid closure (Lagophthalmos)
• Often associated with MCT and LCT laxity
• Brow ptosis