23. paediatric ocular pathology- external eye Flashcards
(40 cards)
what does the external eye consist of?
eyelids , conjunctiva, cornea, orbit ( a bit)
what is the normal corneal diameter of a child (0-16)?
around 12mm
what condition is presented in this image?
RE opthalmos
What should you do differently when testing a child?
Working with Children
• Attitude
— The child and family at the centre
— involve them
• Talk to the child and parents
— Sense - don’ t ignore the child
— Don’ t shout!
• Don’ t touch
• Be on the same level
Tip: Leave ophthalmoscopy till end, get parent to touch their forehead and touch the parent instead of child
—>Babies have an innate preference to look at patterns, such as a face
This is the basis of vision testing in infancy
& why parents are such good historians
What eye screening is done to babies?
• Inspected at birth for anomalies, specifically cataract
• Screening for retinopathy of prematurity ( eye disease that can happen in babies born early/ born <3pounds at birth = abnormal blood vessels to grow in the retina & can lead to blindness.)
• 6-8 week eye check ( by paed/health visitor)
• Children with major disabilities require full ophthalmic assessment
• Vision check by orthoptist 4.5 to 5 years
• Continue, if in place, vision & colour screening @ 11-14 years
In neonatal (newborn) eye exams, what are we looking for ?
• Redness
• Size & Symmetry
— Globes
— Corneae
— Pupils (check all normal sizes)
. Clarity
— Corneae
— Lens
• Family queries (check family hx)
What is a Coloboma/ how is it caused ?
Coloboma (of the iris, ciliary body, choroid, retina and/or optic nerve) derive from failed or incomplete closure of the embryonic fissure (around 4-5 wks gestation ) during development.
What is a ptosis?
— Drooping of eyelid ,
usually upper ( can be either )
What is the epicanthus?
— Vertical fold of skin over inner canthus
What is a telecanthus ?
— Increased distance between inner canthi
What is hypertelorism ?
Increased inner & outer canthal distances - ie
orbits set wider apart
What are the classifications of a ptosis?
• Congenital
— Isolated -ptosis on its own - no other symptoms
— As part of a syndrome -eye lid has sympathetic, 3rd and 5th nerve supplying it
(Always think is it purely an eye problem or a systemic condition ?)
• Neurogenic
— Illrd nerve palsy
— Horner’s
— Marcus Gunn
• Myogenic (muscles )
— Myasthenia - Gravis - common in elder pxs
— Progressive external ophthalmoplegia
-> Eyelid muscles + EOMs involved
• Mechanical
— Lump e.g. - meibomian cyst or tumour
what are the consequences of ptosis?
· Vision
· Refractive status
-Can induce astigmatism & thus:
· Amblyopia
· Compensatory head posture
· Cosmesis - surgery better at age 4-5 years of age - however some parents may not wait as long
- amblyopic ptosis (complete ptosis that obscures sight) = surgical treatment a few days after birth
what is congenital ptosis?
caused by:
- Dystrophy/dysgenesis of levator palpebrae superioris
· Features:
- 1 or 2 eye lids
- Absence skin crease
- Lid lag on downgaze
- Superior rectus weakness (elevation)
- Normal eyelids - note creases
- Note absence of eyelid crease - feature of congenital ptosis & due to abnormal insertion of levator tendon
what is marcus gunn ptosis?
-neurogenic
· Also known as jaw winking
- When baby drinks from bottle/eats something, eyelid shoots up
· Elicit by asking the patient, usually a child to chew something
· Due to abnormal connections between levator and Lateral pterygoid muscle i.e 3rd and 5th cranial nerves
· The condition is an abnormality of 3rd and 5th cranial nerves
what is Horners syndrome?
Ptosis
- Less than 2 mm - very mild
· Heterochromia if present at birth/congenital
- Congenital only - usually develops 1-2 years after birth
· Enophthalmos (sunken eye)
- Very subtle
· Anhidrosis
- Unable to sweat normally on affected side
· miosis - constricted pupil
· Lower IOP on affected eye - subtle
Image: what is Horners syndrome?
What are the neurogenic causes of ptosis ?
ptosis due to 3rd oculomotor palsy
· Ptosis (complete) due to 3rd nerve palsy
- Pupil fibres - superficial sensitive to compression
- Unilateral ptosis
· If px has a unilateral complete ptosis with eye movement abnormality - the lesion is either in nucleus or orbit
What is aberrant regeneration of 3rd nerve palsy ?
aberrant regeneration of 3rd nerve palsy
· Aberrant regeneration of 3rd nerve following trauma
· Branches of 3rd nerve are misdirected (aberrant regeneration)
· Right 3rd nerve palsy - when px tries to look up, the affected RE moves out and down
o When px looks down RE moves out and up as well
What is the management of ptosis ?
· Refer for medical opinion:
- If there is a possibility of a medical condition/syndrome
- If unsure ask other people/refer
· May need to correct:
- Refractive error which may cause Amblyopia
- Compensatory head posture - If marked
- Cosmetic - best left until child is 4-5 years old
· Surgery & ptosis props (not children):
- Urgency according to impact on child
-> If obscuring vision requires correction immediately ( because will cause ambly quickly)
-> Otherwise around 4-5 years achieve better results
Name the types of eyelid lumps
INFLAMMATORY=
-Meibomian cyst
- Hordeolum
- Molluscum contagiosum
· Stasis (fluid in meibomian ducts)
· Tumour
- Benign e.g neurofibroma
- Malignant
· Hamartoma - developmental abnormalities
· Hemangioma-> Treated with propanolol
what is Sturge Weber’s syndrome?
-follows the nerve that does not cross the midline
-‘port wine stain birthmark, present at birth, rare neurological disorder’
what is capillary haemangioma?
- difficult to treat
- tend to resolve around 5-7 yrs
- effective treatment = propranolol
what is a chalazion (meibomian cyst) & how is it treated?
-blockage of the meibomian gland duct, with retention of secretion
( doesnt involve lid lashes like a stye and point of cyst = midway of the tarsus & NOT on lid margin)
treatment:
· Tend to resolve over weeks or many months
· Use warm compresses
· (sometimes forms abcess /nodule is large and gets removed) –>Incise and curette - but requires general anaesthetic in the child
-antibiotics not useful- unless acute (severe) stage
what is a hordeolum (stye) & treatment?
-an infection of the meibomian gland (internal)
-infection of eyelash follicle and corresponding glands of zeis & moll (external)
treatment:
-warm compress
-topical antibiotics
