Delayed intraocular lens dislocation after neodymium:YAG capsulotomy

Area of Science:

• Ophthalmology
• Biomaterials Science

Background:

• Cataract surgery, specifically extracapsular cataract extraction (ECCE), often involves intraocular lens (IOL) implantation.
• Poly(methyl methacrylate) (PMMA) IOLs are commonly used.
• Neodymium:YAG (Nd:YAG) laser posterior capsulotomy is a procedure to address posterior capsule opacification after cataract surgery.

Observation:

• Two cases are presented where a PMMA IOL dislocated into the vitreous cavity following an Nd:YAG capsulotomy.
• Case 1 involved an IOL dislocated 19 months after ECCE and sulcus fixation, with dislocation occurring 6 months post-capsulotomy.
• Case 2 involved an IOL dislocated into the vitreous cavity within an intact capsular bag 4 years after ECCE and intracapsular IOL implantation, with dislocation occurring 6 months post-capsulotomy.

Findings:

• Delayed IOL dislocation into the vitreous cavity can occur after Nd:YAG capsulotomy.
• Different mechanisms contributed to dislocation: radial tearing of a large capsular defect in one case, and zonulysis in the other.
• The intact capsular bag did not prevent dislocation in the second case.

Implications:

• Ophthalmologists should be aware of the potential for delayed IOL dislocation after Nd:YAG capsulotomy.
• Careful patient selection and monitoring may be necessary for patients undergoing Nd:YAG capsulotomy, especially those with pre-existing capsular defects or longer intervals post-surgery.
• Further research into the biomechanical effects of Nd:YAG laser on the capsular bag and IOL fixation is warranted.