Positional and rotational stability of the toric phakic intraocular lens under high +Gz environments.
BACKGROUND
Phakic intraocular lens (PIOL) implantation is a surgical option for correction of refractive errors. PIOLs can be use to correct myopia, hyperopia, and astigmatism. It is a surgical option available to patients in addition to methods such as laser cornea refractive surgery, e.g., laser assisted in-situ keratomileusis (LASIK) and photo-refractive keratectomy (PRK). Visian implantable collamer lens (ICL) are posterior chamber lenses which are surgically positioned in a phakic eye in the sulcus between the iris diaphragm and the natural crystalline lens.


METHODS
This case report describes the stability of Visian toric ICL in a candidate with bilateral implants under high +Gz force exposure in a human centrifuge trainer. The subject was sequentially exposed to three incremental +Gz profiles of +5 Gz, +7 Gz, and +9 Gz. Pre- and post-+Gz exposure, ophthalmic examination revealed no ICL displacement, implant touch or induced cataract, or change in refractive error.


CONCLUSIONS
The rotational stability of the toric implants was also demonstrated by identical subjective refractions in both eyes taken pre- and post-+Gz, exposure. A search of the literature did not reveal any published articles on intraocular stability of ICL in the +Gz environment. This case report suggests that ICL may be considered an alternative to laser refractive surgery for patients subjected to a high +G, environment such as military aviators.
Vision Performance Centre, Singapore Armed Forces Military Medicine Institute, Singapore. marcustcl@hotmail.com
Marcus C L
MC
Tan
Gerard K M
GK
Nah
D000328:Adult; D000337:Aerospace Medicine; D002498:Centrifugation; D005260:Female; D006801:Humans; D018471:Hypergravity; D019654:Lens Implantation, Intraocular; D007910:Lenses, Intraocular; D054140:Refractive Surgical Procedures; D014792:Visual Acuity