EOTech M914 (AN/PVS-14) Monocular Night Vision Device - Manual (Page 39)

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2.10 DIOPTER ADJUSTMENT
The eyepiece may be focused to accommodate differences
in the visual acuity of individual operators, from +2 to -6
diopters. While looking at an object at least 9.8 inches
(25cm) from the MNVD, rotate the diopter adjuster to
achieve the sharpest possible image.
2.11 STARTUP PROCEDURES
To achieve optimal performance and image clarity, the
following procedures should be accomplished in the order
presented, each time the MNVD is placed into use.
1. Perform mounting procedures and positioning
adjustments as applicable:
a. For head or helmet-mounted configurations, don the
headmount and MNVD and make all positioning
adjustments per section 2.3.
b. For weapon-mounted configurations, install the
weapon mount assembly and mount to the host
weapon per section 2.4.
2. Turn the Mode Switch to the desired position per section
2.6.
3. Adjust the gain (contrast) to a comfortable viewing level
per section 2.8.
4. Rotate the objective focus ring for best image clarity.
5. Make diopter adjustments per section 2.10.