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Effect of Pterygium on the Calculation of Intraocular Lens Power

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DOI: 10.23977/medsc.2022.030804 | Downloads: 12 | Views: 515

Author(s)

Xueji Wu 1, Anran Chen 2, Haifeng Zhao 1, Chenchen Feng 1, Jinghong Dong 1, Mingming Zhen 1

Affiliation(s)

1 Department of Ophthalmology, Affiliated Hospital of Wannan Medical College, Wuhu, Anhui, 241000, China
2 Department of Ophthalmology, Taihe County People's Hospital, Fuyang, Anhui, 236600, China

Corresponding Author

Haifeng Zhao

ABSTRACT

Purpose: To evaluate the effect of pterygium on the intraocular lens (IOL) power by bioassay, and reduce the error of the degree of intraocular lens before cataract combined with pterygium resection. Methods: A total of 68 eyes of 34 subjects who were scheduled for unilateral primary pterygium excision and limbal stem cell autograft transplantation were included in this study. Anterior segment photographed images were taken of eyes with pterygia to calculate the pterygium length and area using the ImageJ program. Preoperative and 3-month postoperative the best corrected distance visual acuity (BCDVA), corneal astigmatism, corneal curvature radius, corneal curvature, axial length, anterior chamber depth, and intraocular lens degree (SK-T、SK-Ⅱ) were obtained for eyes with pterygium and their healthy fellow eyes (control group). Results: 34 pterygium patients were included, with a mean age of 55.9 years and a standard deviation of 6.9. The average pterygium measured 3.21 ±0.92 mm in length, 5.69 ±1.15 mm in breadth, and 9.55 ±4.20 mm2 in area. IOL power and related factors are positively correlated with the size of pterygium. If the pterygium size is larger than 2.40mm, 5.60mm or 7.38mm2 and simultaneous surgery is planned, the implanted IOL power should be at least 0.50 D smaller than the calculated power. Conclusions: According to the size of pterygium, corneal astigmatism before surgery, the difference of corneal astigmatism in both eyes before surgery, the difference of IOL power in both eyes before surgery and the difference of IOL power before and after surgery, cataract surgeons can prepare an optimal surgical strategy for pterygium combined with cataract patients.

KEYWORDS

Pterygium, IOL Power, Corneal Curvature, Corneal Astigmatism

CITE THIS PAPER

Xueji Wu, Anran Chen, Haifeng Zhao, Chenchen Feng, Jinghong Dong, Mingming Zhen, Effect of Pterygium on the Calculation of Intraocular Lens Power . MEDS Clinical Medicine (2022) Vol. 3: 29-36. DOI: http://dx.doi.org/10.23977/medsc.2022.030804.

REFERENCES

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