23 June 2021, 6:01 amHormonal contraception, like the pill, may more than double a woman's risk of developing glaucoma.
When taken correctly, the pill is more than 99% effective at preventing pregnancies. Although generally considered to be safe, the contraceptive has been linked to breast cancer and blood clots. Nevertheless, "women on hormonal contraceptives who experience visual changes should have these symptoms examined by an ophthalmologist", he added.
To learn more, the British Columbia scientists analysed the electronic health records of more than 11,000 women, aged 15 to 45. More than 2,300 of the women developed glaucoma over the next 10 years. "This is probably because a potential causal link between HCs [hormonal contraceptives] and glaucoma requires current exposure to these drugs," the scientists wrote in the British Journal of Clinical Pharmacology.
Progesterone suppresses natural oestrogen, with the hormone "hypothesised to exert a protective effect against glaucoma".
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