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Takashi Ono, Yosai Mori, Ryohei Nejima, Kentaro Abe, Jinhee Lee, Takuya Iwasaki, Makoto Aihara, Kazunori Miyata; Comparison of long-term corneal topographic changes after surgery of recurrent pterygia and primary pterygia. Invest. Ophthalmol. Vis. Sci. 2019;60(9):2124.
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The restoration of corneal topographic changes after surgery of primary pterygia depends on size but that of recurrent pterygia of each size were not disclosed. We compared long-term topographic changes after surgery of recurrent and primary pterygia depending on their size.
This study was a retrospective observational study. Inclusion criteria were eyes which underwent excision of recurrent pterygia at Miyata Eye Hospital from 2002 to 2013 and were observed for more than 12 months. Exclusion criteria were eyes which underwent previous operations for pterygium more than two times or excision of pterygium of both sides. Age, sex and size of pterygia matched patients who underwent primary pterygia served as controls. Size of pterygia was graded according to the advancing edge position: less than one third of corneal diameter (grade1), outside the pupil (grade 2), and within the pupillary area (grade 3). Surface asymmetry index (SAI) and surface regulatory index (SRI) in corneal topography and the rate of changes were compared before, 1, 3, 6 and 12 months after operation. Welch’s t test was used as statistical analysis.
Thirty-four eyes of 34 patients of recurrent pterygia and 34 eyes of 34 patients of primary pterygia were included. The numbers of eyes with grade 1, 2, and 3 of primary and recurrent pterygia were 3, 18, and 13, respectively. Mean age was 73.7±1.5, 70.0±8.8, and 68.5±7.6 years in recurrent pterygia and 74.3±1.5, 69.1±9.4, and 68.7±7.6 years in primary pterygia, respectively. Grade 1 did not show significant difference at each observation point. Grade 2 showed that SAI was significantly higher at all observation points (p = 0.01, 0.03, 0.02, 0.02, and 0.002) and SRI was significantly higher before, 1, 6, and 12 months after operation (p=0.01, 0.07, 0.04, and 0.02) in recurrent pterygia. There was no difference in rate of changes. Grade 3 showed that SAI was significantly higher at all observation points (p=0.04, 0.01, 0.01, 0.06, and 0.02) and SRI was significantly higher before, 6, and 12 months after operation (p<0.001, p=0.07 and 0.02) in recurrent pterygia. There was no difference in rate of changes except for 1 month after operation (p=0.01).
Corneal irregularity after surgery was larger in recurrent pterygium than in primary pterygium in the same size, but the rate of changes was almost identical for 12 months.
This abstract was presented at the 2019 ARVO Annual Meeting, held in Vancouver, Canada, April 28 - May 2, 2019.
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