Tianjin Eye Hospital， Tianjin Key Lab of Ophthalmology and Visual Science， Tianjin Eye Institute， Clinical College of Ophthalmology， Tianjin Medical University， Tianjin 300020， China
ObjectiveTo investigate the characteristics and relevant factors of intraocular stray light before and after small incision lenticular extraction （SMILE）. MethodsIn a prospective case study， 67 myopic and myopic astigmatism patients （67 eyes） underwent SMILE surgery in Tianjin Eye Hospital. Stray light measurements were taken before SMILE surgery and 1 week， 1 month， 3 months and 6 months after surgery using an Oculus C-Quant stray light meter. Pearson correlation was used to identify correlations in stray light values for such factors as age， spherical equivalent refractive error， central corneal thickness （CCT）， mean keratometric value， and corneal curvature radius as well as for surgical factors such as cap diameter， hinge width， ablation depth， ablation ratio， residual bed thickness， RBT/CCT and energy. ResultsThe stray light values preoperatively， and 1 week， 1 month， 3 months and 6 months after SMILE surgery were 0.93±0.16， 0.97±0.14， 0.94±0.17， 0.94±0.17， and 0.90±0.17， respectively. The mean stray light value was slightly higher 1 week after surgery but no significant differences were found. There were no significant differences when the various time points were compared （F=2.253， P>0.05）. While the changes in stray light values after surgery were not correlated with surgical parameters， there was a slight positive correlation with hinge width at 3 months after surgery （r=0.356， P<0.01）. ConclusionThere are no significant differences in stray light between pre- and post-SMILE surgery. It may be possible that a change in stray light could cause a decrease in visual quality.
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