Abstract
Purpose:To report findings that could suggest an elliptical shape of the capsular bag.Methods:Five eyes of three patients with axial length greater than 24 mm underwent phacoemulsification cataract surgery with plate-haptic multifocal toric intraocular lens (IOL) implantation oriented in the vertical meridian.Results:In all cases, correct orientation of the IOLs was verified 30 minutes after surgery. After 24 hours, all eyes demonstrated unwanted rotation of the IOLs ranging from 15 to 45 degrees. The IOLs remained stable in the new position in all cases until adhesion of the capsular bag took place.Conclusion:These observations could suggest that the perimeter of the capsular bag has an elliptical shape. Therefore, the IOL tends to become fixated in a meridian of the capsular bag that best fits the diagonal diameter of the IOL.
Highlights
Knowledge of the shape of the lens capsule perimeter is a relevant issue because intraocular lenses (IOLs) implanted within the capsular bag obtain their stability from the support offered by its perimeter.[1]
We have previously demonstrated that the position of IOLs with C‐loop haptics significantly changed with respect to the center of the cornea due to rotation of the IOL within the capsular bag.[7]
It is unclear why the IOLs rotate a few hours after surgery into a new stable meridian different from the intended one, instead of turning randomly until adhesion of the capsular bag takes place to stabilize the IOL; this adhesion never occurs before 2 days
Summary
Knowledge of the shape of the lens capsule perimeter is a relevant issue because intraocular lenses (IOLs) implanted within the capsular bag obtain their stability from the support offered by its perimeter.[1]. We have previously demonstrated that the position of IOLs with C‐loop haptics significantly changed with respect to the center of the cornea due to rotation of the IOL within the capsular bag.[7] As IOL haptics shrink and extend symmetrically and the achieved centration is stable after surgery, a reasonable explanation could be than the perimeter of the capsular bag is not round Is the capsular bag perimeter round or elliptical? J Ophthalmic Vis Res 2016;11:159-61
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