Instrument Components; Fdt Overview - Zeiss Humphrey FDT 710 User Manual

2-6
Introduction

Instrument Components

The instrument has seven Buttons to control the operation of the instrument, located
adjacent to the Operator's Liquid Crystal Display (LCD).
• Four BLUE Operator Buttons along the left side of the Operator LCD Display
• A GREEN Cancel/Backup Button below the four BLUE Buttons
• Two Operator LCD Display Contrast Adjustment Buttons (Down Arrow and Up Arrow)
adjacent to the Contrast Symbol and directly below the LCD Operator Display
Further below the Operator LCD Display is a Paper Access Door which opens to provide
access to the internal thermal printer for replacement of paper, when needed. The
instrument has a sliding Patient Visor which aids in the selection of the eye to be tested
and automatically occludes the opposite (untested) eye. Detachable Patient Response
Button, Power Cord, and Calibration Cap are also provided.

FDT Overview

isolates a subset of retinal ganglion cell mechanisms in the magnocellular (M-cell)
FDT
pathway. These M-cells have large diameter fibers and comprise only 3% to 5% of all
retinal ganglion cells. The damage of these cells in the disease process makes FDT efficient
and effective for the detection of visual field loss.
Humphrey FDT User Manual 2660021149532 Rev. B 2015-11