A study of histopathological features of latanoprost-treated irides with or without darkening compared with non-latanoprost-treated irides

Daniel M. Albert, Ronald E. Gangnon, Hans E. Grossniklaus, W. Richard Green, Soesiawati Darjatmoko, Amol D. Kulkarni

Research output: Contribution to journalArticle

8 Scopus citations

Abstract

Objectives: To study the histopathological features of latanoprost-treated irides with or without darkening, compared with non-latanoprost-treated irides. Methods: Iridectomy specimens and patient history forms were independently examined by 3 ophthalmic pathologists in a masked fashion. Specimens were evaluated for premalignant changes and for differences in level of pigmentation and degrees of cellularity, inflammation, and vascular abnormalities. Results: The specimens consisted of 22 latanoprost-treated darkened irides, 35 latanoprost-treated irides without darkening, and 35 non-latanoprost-treated irides. There was a statistically significant decrease in the number of nuclear invaginations and prominent nucleoli in latanoprost-treated darkened irides compared with the other 2 groups (P = .004 and P = .005, respectively). The average thickness and pigmentation of the anterior border layer was greater in the latanoprost-treated darkened irides than in the other 2 groups (P = .03 and P = .02, respectively). The latanoprost-treated darkened irides had increased pigmentation of the stroma (P < .001), stromal fibroblasts (P < .001), melanocytes (P = .005), vascular endothelium (P = .02), and adventitia (P < .001) relative to the other 2 groups. Conclusions: There is no histopathological evidence of premalignant changes in latanoprost-treated darkened irides. The latanoprost-induced iris color changes are due to a thickening of the anterior border layer and an increased amount of melanin in the anterior border layer and within the stromal melanocytes.

Original languageEnglish (US)
Pages (from-to)626-631
Number of pages6
JournalArchives of ophthalmology
Volume126
Issue number5
DOIs
StatePublished - May 1 2008

ASJC Scopus subject areas

  • Ophthalmology

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