Figure 2: Pupillary response to instillation of neostigmine (right eye) and saline (left eye). Images A-D=right eye; Images E-H=left eye. A=Pre neostigmine (6.0mm); B=30 mins post neostigmine (2.0mm); C=60 mins post neostigmine (1.5mm); D=1 week after daily instillation of 1 drop of neostigmine, last drop 24 hours previously (6.0mm); E=Pre saline (7.0mm); F=30mins post saline drop (7.5mm); G=60mins post saline drop (7.0mm); H=1 week after daily instillation of 1 drop of saline, last drop 24 hours previously (7.0mm).