Education, Science, Technology, Innovation and Life
Open Access
Sign In

Effect of Pterygium on the Calculation of Intraocular Lens Power

Download as PDF

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


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


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


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.


Pterygium, IOL Power, Corneal Curvature, Corneal Astigmatism


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:


[1] Chu, W.K., Choi, H.L., Bhat, A.K. and Jhanji, V. (2020) Pterygium: New Insights. Eye (Lond) 34, 1047-1050. 
[2] Tang, Y. Et Al. (2020) Influences of the Three-Dimensional Parameters of Pterygium on Corneal Astigmatism and the Intraocular Lens Power Calculation. Sci Rep 10, 5017.
[3] Oner, F.H., Kaderli, B., Durak, I. and Cingil, G. (2000) Analysis of the Pterygium Size Inducing Marked Refractive Astigmatism. Eur J Ophthalmol 10, 212-214.
[4] Kamiya, K., Shimizu, K., Iijima, K., Shoji, N. and Kobashi, H. (2015) Predictability of Intraocular Lens Power Calculation after Simultaneous Pterygium Excision and Cataract Surgery. Medicine (Baltimore) 94, E2232. 
[5] Koc, M., Et Al. (2016) Pterygium Size and Effect on Intraocular Lens Power Calculation. J Cataract Refract Surg 42, 1620-1625.
[6] Dogan, E., Cakir, B., Aksoy, N.O. and Alagöz, G. (2021) The Effect of Pterygium Surgery on Intraocular Lens Power and Ocular Biometric Parameters. Ir J Med Sci.
[7] Niruthisard, D., Tulvatana, W. and Satitpitakul, V. (2021) Time to Keratometric Stability after Pterygium Excision and the Associated Factors: A Clinical Perspective. Clin Ophthalmol 15, 1277-1283.
[8] Nejima, R., Et Al. (2015) Topographic Changes after Excision Surgery of Primary Pterygia and the Effect of Pterygium Size on Topograpic Restoration. Eye Contact Lens 41, 58-63.
[9] Gumus, K., Erkilic, K., Topaktas, D. and Colin, J. (2011) Effect of Pterygia on Refractive Indices, Corneal Topography, and Ocular Aberrations. Cornea 30, 24-29.
[10] Oltulu, R., Demirel, S., Sarac, O. and Ozer, M.D. (2013) Evaluation of Corneal and Anterior Chamber Changes Following Pterygium Surgery Using A Pentacam Scheimplug System: A Prospective Study. Semin Ophthalmol 28, 206-209.
[11] Dogan, E., Cakir, B., Aksoy, N. O. and Alagöz, G. (2022) The Effect of Pterygium Surgery on Intraocular Lens Power and Ocular Biometric Parameters. Ir J Med Sci 191, 2399-2403.
[12] Khan, F.A., Khan Niazi, S.P. and Khan, D.A. (2014) The Impact of Pterygium Excision on Corneal Astigmatism. J Coll Physicians Surg Pak 24.
[13] Kim, S.W., Park, S., Im, C.Y., Seo, K.Y. and Kim, E.K. (2014) Prediction of Mean Corneal Power Change after Pterygium Excision. Cornea 33, 148-153.
[14] Shahraki, T., Arabi, A. and Feizi, S. (2021) Pterygium: An Update on Pathophysiology, Clinical Features, and Management. Ther Adv Ophthalmol 13, 25158414211020152.
[15] Savini, G., Taroni, L. and Hoffer, K.J. (2020) Recent Developments In Intraocular Lens Power Calculation Methods-Update 2020. Ann Transl Med 8, 1553.
[16] HipÓLito-Fernandes, D., Et Al. (2022) Anterior Chamber Depth, Lens Thickness and Intraocular Lens Calculation Formula Accuracy: Nine Formulas Comparison. Br J Ophthalmol 106, 349-355.

Downloads: 4917
Visits: 217482

Sponsors, Associates, and Links

All published work is licensed under a Creative Commons Attribution 4.0 International License.

Copyright © 2016 - 2031 Clausius Scientific Press Inc. All Rights Reserved.