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Clinical studies have shown that 71% of participants achieved total relief from symptoms of PMS using the Rio Lightmask. Developed at the Hammersmith Hospital in London in conjunction with Dr D Anderson and his colleagues, this drug free treatment uses photic stimulation in the form of programmed patterns of gently pulsating light shone into closed eyes for 15 minutes per day.

During PMS the body’s internal clock becomes de-synchronised from the external rhythm of day and night. The research at Hammersmith Hospital suggests that use of pulsing light helps the clock re-synchronise helping to reduce PMS symptoms on average by 76 per cent. Clinically and statistically significant reductions were recorded for depression, anxiety, irritability, lability (emotional instability), poor concentration, fatigue, good cravings, bloating and breast pain.

The Rio Lightmask has five programmes. For PMS sufferers programme 1 is recommended for one 15 minute session per day just before going to sleep. After a few months, it is sometimes possible to stop using the Lightmask for several days after your period starts, but it should be used again before you reach mid-cycle. Programmes 4 (Relaxation and Sleep) and 5 (Advanced), may also offer relaxation from PMS symptoms.

The Rio Lightmask is deeply calming and relaxing and easy to use. The soft comfortable mask fits snugly over the eyes and a small digital control unit allows the wearer to set the light brightness, frequency and select the required programme. After each 15 minute treatment session the unit will automatically switch itself off. It is lightweight and portable and can easily travel with you wherever you go.

Nearly all women of child-bearing age suffer from some form of PMS. Women between their 20s and 40s are most likely to suffer and for a small number, the symptoms may be so severe that it disrupts their daily lives. The Rio Lightmask is good news for those who may prefer to try a natural way to prevent PMS before or in addition to taking prescription medicines.

Where to Buy

Battery powered for portability the Rio Lightmask costs £44.95 and an additional mains adaptor is available to purchase separately priced £9.95 from or call 0870 350 1264.

- ENDS -

Notes to Editor:

• People who have a history of epilepsy or seizures should use the Lightmask only under medical supervision


Anderson,DJ; Legg,NJ; Ridout,DA. - "Preliminary trial of Photic Stimulation for Premenstrual Syndrome" - Journal of Obstetrics and Gynaecology, 17(1):76-79, 1997.


In an open study 17 women with confirmed, severe and long-standing premenstrual syndrome used Photic Stimulation with a flickering red light, every day for up to four menstrual cycles. At the end of treatment prospectively recorded median luteal symptom scores were reduced by 76% (95% confidence interval 54-93, P<0.001), with clinically and statistically significant reductions for depression, anxiety, affective lability, irritability, poor concentration, fatigue, food cravings, bloating and breast pain. Twelve of the 17 patients (71%) no longer had the premenstrual syndrome. One patient failed to improve. One patient withdrew because of worsening premenstrual depression, but Photic Stimulation was otherwise well tolerated. The improvement is greater than that reported for relaxation or in open studies of fluoxetine, and much more than historical placebo rates. Photic Stimulation may be a useful treatment for the premenstrual syndrome, and by its suggested action on circadian rhythms may have wider therapeutic applications.

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Michelle Redmond at Minx PR
Tel: 020 8288 0849

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