Indian clinicians have described how a 35-year-old patient suffered sudden vision loss following the spontaneous dislocation of a phakic iris claw intraocular lens (IOL).
Writing in BMJ Case Reports, the authors highlighted that the patient presented at hospital with a painless diminution of vision and diplopia in his right eye over a three day period.
The patient’s vision was 6/60 in his right eye and 6/6 in his left eye. There was no history of trauma.
However, the patient had phakic iris claw intraocular lenses implanted in both eyes 12 years previously.
A slit lamp examination revealed that the IOL was hanging inferiorly with the optic touching the corneal endothelium inferiorly and with the other end fixed in the 9 o’clock position.
Re-enclavation of the IOL to the iris was performed under local anaesthesia, with the lens fixed to a site that was slightly superior to the previous site.
A day after the operation, the patient’s vision was restored to 6/6 in his right eye, unaided.
“Although post-traumatic dislocation of the IOL has largely been reported, spontaneous late disenclavation of the iris claw lens is a rare complication,” the authors noted.
They highlighted that the ideal location of the enclavation is the mid-peripheral iris stroma, where the IOL is “virtually immobile.”
Image credit: BMJ Case Reports 2018