Figure 2
From: Infrared- and white-light retinal sensitivity in glaucomatous neuropathy

Block diagram of the the optical setup for infrared-light retinal-sensitivity measurements. λ = wavelenght; F = repetition frequency; \(\tau\) = pulse width; SM = single mode; NDF = neutral density filter; PM = power meter; PH = pinhole; LD = laser diode; APD = avalanche photodiode; SLO = scanning laser ophthalmoscopy, PC = personal computer18.