Ophthalmologists spend significant amounts of time during cataract surgery trying to precisely center an implanted IOL to achieve the best possible vision after surgery. The high success rate of cataract surgery suggests that in most cases, they succeed.
But there have been long-nagging questions about IOL movement within the capsular bag after cataract surgery. Some data suggest that IOLs may shift position by 500 µm or more following surgery–a sufficient drift to degrade vision. However, results from what may be the largest study of IOL stability in the 30 days following implantation suggest that once implanted, IOLs tend to remain within 200 to 300 µm of the original position.
“We found that the center of both monofocal IOLs and toric IOLs is essentially unchanged from day 1 after cataract surgery to 30 days after surgery,” said Florence Cabot, MD, senior research associate, Bascom Palmer Eye Institute, University of Miami. “Furthermore, we did not see any difference in IOL centration between manual cataract surgery and femtosecond laser procedures between day 1 and 30 days postop.”