Cystoid macular oedema (CMO) is swelling of the central retina caused by fluid accumulation in microscopic cyst-like spaces. It is one of the most common reasons for delayed visual recovery after cataract surgery.
Posterior capsule rupture increases the risk of CMO for two principal reasons.
First, PCR usually makes the operation longer and more complex. Increased surgical manipulation raises inflammatory mediator release (particularly prostaglandins), which increases blood–retinal barrier permeability.
Second, vitreous prolapse can create subtle traction on the macula. Even if a formal vitrectomy is performed, inflammatory signalling between the anterior and posterior segments is amplified when the capsule barrier is breached.
Large database studies confirm this association. Chu et al., analysing over 80,000 cataract operations, identified PCR as one of the strongest predictors of post-operative macular oedema ¹. Henderson et al. similarly demonstrated significantly elevated odds of CMO when capsule complications occur ².
The key point is this: CMO risk is increased, but it is predictable and treatable.
After PCR, extended anti-inflammatory therapy (steroids and NSAIDs) substantially reduces the risk of persistent oedema. OCT scanning is performed early if recovery is slower than expected ³.
Most PCR-related CMO resolves within weeks, and long-term visual outcomes are typically comparable to uncomplicated surgery when managed proactively.
Inflammation is expected. It is countered early and methodically.
References
- Chu CJ, Johnston RL, Buscombe C, Sallam AB, Mohamed Q, Yang YC. Risk factors and incidence of macular oedema after cataract surgery: a database study of 81,984 eyes. Ophthalmology. 2016;123(2):316-323.
- Henderson BA, Kim JY, Ament CS, Ferrufino-Ponce ZK, Grabowska A, Cremers SL. Clinical pseudophakic cystoid macular edema: risk factors for development and duration. J Cataract Refract Surg. 2007;33(9):1550-1558.
- Loewenstein A, Zur D. Postsurgical cystoid macular edema. Dev Ophthalmol. 2017;58:178-190.
Related Topics
- What is Posterior Capsule Rupture?
- Why is my risk of retinal detachment increased after PCR?
- Why is there increased cystoid macular oedema (CMO) after PCR?
- Why might my eye pressure rise after PCR?
- When will I be seen again after PCR?
- What does PCR mean for my bilateral surgery?
- Will my vision be ok after posterior capsule rupture?
- Will my vision be ok after dropped nucleus surgery following PCR?
- How long will the operation take if PCR occurs?
- Can I go to Moorfields for a second opinion instead?
- If I seek a second opinion, can I still have my corrective surgery at Blue Fin Vision®?
- What happens to my fees if I cancel the second eye after PCR?
- Is my risk higher for the second eye if I had PCR in the first?
- What is anterior vitrectomy and why is it performed after PCR?
- What is a three-piece monofocal lens and why is it used after PCR?
- What is a sulcus supplementary (Sulcoflex) lens?
- What is dropped nucleus and why does it happen after PCR?
- What is expulsive suprachoroidal haemorrhage and why is it mentioned with PCR?
- Why does pseudoexfoliation increase the risk of PCR?
- Why do very dense cataracts increase the risk of PCR?
- Is posterior capsule rupture negligence?
