Posters

Effect of laser energy levels on surgery and visual outcomes of small-incision lenticule extraction: a matched case-control study

Poster Details

First Author: J.Bai CHINA

Co Author(s):    L. Liu   T. Zhang                 

Abstract Details

Purpose:

To investigate the effect of different energy settings for SMILE on surgery.

Setting:

Chongqing Ophthalmological Hospital, Chongqing, China

Methods:

The left and right eye of the myopia patients were randomly assigned into high or low energy setting group (30 eyes for each group). Meanwhile, the standardised SMILE was performed by the same surgeon using the VisuMax with consistent operation design, time, operating room environment, equipment and the scan density. The energy setting for the high and low energy groups were 150 and 125 nJ, respectively. OBL, non-occlusive black spot, lenticule edge "burr" and separation resistance were evaluated and UDVA, CDVA, corneal topography, OSI and MTF were observed at different postoperative points.

Results:

Automatic image analyser showed that OBL and lenticule edge vague in the high energy group were more serious than in the low energy group. Meanwhile, the separation resistance is higher. One day after surgery, the visual acuity of naked eyes in the low energy group was better than that in the high energy group but with no statistical difference. The visual objects in the low energy group were significantly better than those in the high energy group. Compared to the low energy group, the 1 day, 1 week and 1 month ISO postoperatively was higher in high energy group with statistically significant difference.

Conclusions:

Our study demonstrated that both energy settings were safe and effective for SMILE. Compared to the high energy group, better visual acuity and visual quality could be achieved in the low energy group.

Financial Disclosure:

None