Abstract
BACKGROUND: A light-adjustable lens™ (LAL) (RxSight, Inc.) is an intraocular lens inserted during cataract surgery. The lens shape can be changed after surgery by ultraviolet light using a Light Delivery Device™ (LDD) to adjust the subjective refractive power. This study evaluated shape changes in the LAL using anterior segment optical coherence tomography (OCT). CASES: In Case 1, the right eye of a 70-year-old male was examined. Spherical power changed from +0.75 D to -0.25 D after LDD adjustment with a target of S-0.5 D. Shape analysis using anterior segment OCT showed that the radius of curvature of the front surface of the LAL decreased from 11.59mm to 9.03mm, while that of the back surface increased from 10.98mm to 13.41mm after LDD adjustment. In Case 2, we examined the right eye of an 80-year-old female. Refractive power changed from Cyl-1.50 D (axis 105°) to S+0.25 D after LDD adjustment with the target of emmetropia. The radius of curvature of the front of the LAL decreased from 10.26mm to 7.99mm, while that of the back surface increased from 11.10mm to 21.78mm after the LDD adjustment, and that of the back showed a variation in the radius of curvature depending on the refraction angle. CONCLUSIONS: The findings in Case 1 highlighted a change in shape while maintaining a spherical lens shape, while in Case 2, the change in asymmetric shape may have occurred to correct astigmatism on the back of the LAL. Taken together, these findings indicate that anterior segment OCT captures the shape changes in the LAL. The LAL was postoperatively adjusted to the target refraction through shape change.