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Letter
Lack of scientific rationale for use of valproic acid for retinitis pigmentosa
  1. Michael A Sandberg,
  2. Bernard Rosner,
  3. Carol Weigel-DiFranco,
  4. Eliot L Berson
  1. Berman-Gund Laboratory for the Study of Retinal Degenerations, Harvard Medical School, Massachusetts Eye and Ear Infirmary, Boston, Massachusetts, USA
  1. Correspondence to Dr Michael A Sandberg, Berman-Gund Laboratory, Harvard Medical School, 243 Charles Street, Boston, MA 02114, USA; michael_sandberg{at}meei.harvard.edu

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‘Therapeutic potential of valproic acid for retinitis pigmentosa,’ by Clemson et al,1 has significant flaws that militate against their conclusion that short-term valproic acid improved the vision of patients with retinitis pigmentosa.

The investigators should have performed a case–control study, comparing patients taking valproic acid with control patients matched for baseline field and acuity. …

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