Figure 6.

An example of three visual fields from a patient attending the Devers Eye Institute glaucoma clinic, each approximately six months apart. Fields are presented in order of test date, from top to bottom. Apparent change in parts of the superior hemifield between the first two fields is unreliable, since the sensitivities are below 15–19dB, and should not be taken as evidence of glaucomatous progression. At other locations the amount of change could be overestimated.