Free previewYou're reading the free part of this topic. The rest is included with Clinical.See what's included
Exotropia
Strabismus
Key Points
- •Intermittent exotropia X(T) is the most common subtype; hallmark symptom is monocular eye closure in bright sunlight
- •Always perform patch test (1-hour monocular occlusion) or +3.00 D lens test to differentiate true from simulated divergence excess - surgical planning depends on this
- •Newcastle Control Score (0–9) standardizes assessment of control; surgery indicated for deteriorating control, increasing angle, or loss of stereopsis
- •Target slight initial overcorrection (10–15 PD esotropia) after exotropia surgery - the deviation drifts exo over time; immediate orthotropia predicts late recurrence
- •BLR is preferred for basic and divergence excess types; R&R for convergence insufficiency type and unilateral deviations
- •Kushner classification expands Burian's 3 types into 7 subtypes using AC/A ratio + patch test response - tenacious proximal fusion (~40%) is the most common divergence-excess pattern (good surgical prognosis); high AC/A ratio type (~5%) carries poor prognosis with risk of consecutive esotropia at near
Free preview ends here
Keep reading Exotropia
17 more sections are included with the Clinical plan.
- Definition
- Epidemiology
- Aetiology and causes
- Pathogenesis
- Classification
- Risk factors and associations