The Changes Of Intraocular Pressure And The Ocular Axial Length And Postoperative Refractive Outcome In Cataract Surgery Combined With Trabeculotomy Ab Interno.

To examine intraocular pressure, changes of axial length, and postoperative refractive error in cataract surgery combined with trabeculotomy ab interno.

Fifty-two eyes of 52 patients who underwent  cataract surgery combined with trabeculotomy ab interno from September 2020 to June 2022 at Saitama Red Cross Hospital (LOT) and 67 eyes of 67 patients who underwent cataract surgery (CAT) were included in the study. 

Preoperative and 1-month postoperative IOP and Axial length (ALs) were compared; Barrett universal II (Barrett), SRT/T, and Haigis were used to examine refractive error in the two groups.

IOP change was significantly greater in LOT with LOT -6.7 ± 5.5 mmHg and CAT -1.4 ± 2.1 mmHg, and ALs shortening was significantly greater in LOT with LOT 0.16 ± 0.11 mm and CAT 0.11 ± 0.07 mm. (P<0.001, respectively) There was a significant correlation between the change of IOP and ALs in LOT. (p=0.01) Refractive error was significantly smaller for LOT with Barrett 0.09 ± 0.62D, SRK/T 0.34 ± 0.76D, and Haigis 0.65 ± 0.69D. (p<0.001, respectively) The CAT refractive error was Barrett 0.03 ± 0.41D, SRK/T -0.05 ± 0.53D, Haigis -0.63 ± 0.64D. Absolute refractive error was significantly greater for LOT at 0.46 ± 0.42 for Barrett and 0.33 ± 0.24D for CAT. (p=0.04) The percentage within ±0.75D was significantly lower in LOT for Barrett. (p=0.007)

LOT had a larger postoperative refractive error than CAT and a tendency toward hyperopia. This was thought to be due to the shortening of the ALs caused by IOP reduction.