Editor,—I read with considerable interest the paper by Spencer and Vernon1 on the results of a standard protocol for transscleral diode laser cyclophotocoagulation (“cyclodiode”). The particular importance of this paper with regard to more widespread use of this therapy lies in the high percentage (64%) of treated eyes with pretreatment Snellen acuity, and while a third of these eyes lost 2 or more lines of Snellen acuity, it appears this was, in most cases, not directly attributable to the cyclodiode treatment, with particular note being made of the low rate of cystoid macula oedema.1

The authors report success rates in achieving IOP control with a standard protocol, but, as in most other published series, record findings after “repeat as necessary” retreatments (in this study up to five in number). While this is of obvious interest to clinicians, it may be of almost equal utility to know the effect of a single treatment. In an earlier paper, also using a standardised treatment protocol for cyclodiode treatment,2 an attempt was made to elucidate any dose-effect relation from a single cyclodiode treatment session. With a …