Treatment of XXXX using coloured glasses.

@entity1 @entity410 @entity2704 @entity5516 @entity5545
A recently introduced optometric technique, colorimetry, enables the perceptual effects of ophthalmic tints to be evaluated subjectively, optimized, and then prescribed in tinted spectacles. The new technique is beneficial in reducing visual stress in @entity1 with @entity5545 and @entity2704 . We describe an open trial designed to ascertain: (1) whether the colorimetry assessment, as it is now given, is safe for the investigation of photosensitive @entity1 in optometry clinics where colorimetry equipment is most readily available, but where EEG control is not practical; (2) what proportion of @entity1 with @entity5516 is likely to benefit to the extent already described in individual cases; (3) whether a tint selected by colorimetry could be shown to reduce the incidence of paroxysmal epileptiform EEG activity in response to flicker and patterns, thereby validating the subjective methods and corroborating the reported @entity410 reduction. Twenty-four females and nine males (aged 12-43 years) took part. All the @entity1 had suffered visually-provoked @entity410 , had exhibited a photoparoxysmal response on at least one previous EEG recording, and had received a diagnosis of @entity5516 . Twenty-two were currently experiencing @entity410 . A further EEG was recorded in all except seven cases: a routine resting record, followed by hyperventilation. Colorimetry was performed after hyperventilation and before photic stimulation. Twenty-three (70%) reported beneficial effects during colorimetry and were prescribed glasses. There was a preponderance of lenses with a rose or purple colour, in contrast to @entity1 with @entity5545 . Seventeen of the 23 @entity1 were available at follow-up, an average of 2.4 years later. Thirteen (57%) reported benefits, and said they were still using the lenses. In six of the 13 the benefits were pronounced, including a reduction of dizziness from fluorescent lighting, elimination of aura when using computer screens etc. Only in three cases was there a @entity410 that could reasonably be attributed to the use of lenses; in two of these cases no medications were prescribed, and in the third the medications remained unchanged for four years, two before and two after the introduction of the glasses. In an additional four cases a @entity410 was observed but medication had been changed. There was a modest reduction in EEG photosensitivity with the coloured lenses but also to an equivalent or lesser extent with grey in all of the eight @entity1 examined in this way. One @entity1 had @entity410 during colorimetry, but the @entity410 were not accompanied by scalp EEG changes.
