Abstract
Purpose: To describe a patient who developed major topographical changes mimicking post-laser in situ keratomileusis (LASIK) ectasia during breast cancer treatment with tamoxifen. Methods: Case report and literature review. Results: A 36-year-old woman who had had 10 years of stable vision after LASIK surgery was diagnosed as having breast cancer 6 months before presentation. As therapy, the patient received tamoxifen, a selective estrogen receptor modulator. After the initiation of therapy, the patient experienced rapidly decreasing vision in her left eye. Assessment of corneal tomography showed marked steepening with irregular astigmatism, leading to the diagnosis of postoperative ectasia in the left eye. After 3 months of treatment with tamoxifen, the anterior cornea showed marked flattening again and improvement of corrected distance visual acuity, both of which were maintained at the 6-month follow-up visit. Conclusions: Serum estrogen level changes during breast cancer treatment may induce major topographical changes, mimicking postoperative ectasia after LASIK. [ Journal of Refractive Surgery Case Reports. 2024;4(1):e20–e23.]
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