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Toric IOL
Cataract & Refractive Surgery
Key Points
- •A 1-degree misalignment of a toric IOL causes 3.3% loss of cylinder effect; 30 degrees of misalignment completely negates the correction.
- •The Barrett Toric Calculator accounts for posterior corneal astigmatism and is the recommended standard for toric IOL planning.
- •Posterior corneal astigmatism (~0.30 D ATR) must be considered - ignoring it causes over-correction of WTR and under-correction of ATR astigmatism.
- •Optimise the ocular surface (treat dry eye) BEFORE biometry - unstable tear film is the most common cause of inaccurate keratometry.
- •Modern toric IOLs achieve residual astigmatism ≤ 0.50 D in 70–85% of cases with excellent rotational stability.
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17 more sections are included with the Clinical plan.
- Definition
- Epidemiology
- Aetiology and causes
- Pathogenesis
- Classification
- Risk factors and associations