I do not think that the microperimetry is a good option for the PRL rehabilitation. The better option is to make a "task oriented PRL rehabilitation". With the microperimetry, you will force the patient to develop a PRL in a location that you will choose. Under daily life conditions, the patients develop their PRLs according their visual needs and the status of their neuro-visual conditions. Microperimetry is a useful tool to observe the PRL and to understand the retinal sensibility in that region and to estimate the visual potential of the patient.
It's based on my own clinical observations which will be published soon. These articles may help:
Cheung S-H, Legge GE. Functional and cortical adaptations to central vision loss. Vis Neurosci. 2005 ; 22(2): 187–201.
Riss-Jayle M, Giorgi R, Barthes A. La mise en place de Zone Rétinienne Préferentielle. Partie II: Quand? Ou? Pourquoi s’installe-t-elle? J Fr Ophtalmol, 2008; 31 (4): 379-385.