6540-00-142-8709, LENS BLANK,OPHTHALMIC,BIFOCAL,SE

National Stock Number:
6540-00-142-8709

Federal Supply Class:
6540

National Item Identification Number:
001428709

Description:
LENS BLANK,OPHTHALMIC,BIFOCAL,SE

Detail:
A TRANSPARENT OPTICAL ELEMENT CONSISTING OF A MAJOR BLANK AND A BIFOCAL SEGMENT. THE BLANK AND SEGMENT HAVE BEEN PRESSED IN A GLASS MOLD TO AN APPROXIMATE SIZE AND SHAPE, AND ARE GROUND AND POLISHED TO A FINISHED DIOPTER CURVATURE ON ONE SURFACE ONLY.

Manufacturer Information:

MILL36460

81349

MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M

Techincal Specification:

ADDITIONAL POWER RATING IN DIOPTERS	1.500 BIFOCAL
BASE CURVE DIOPTER	8.25 PLUS NOMINAL
CROSS-SECTIONAL SHAPE STYLE	SPHERE
DEPARTURE FROM CITED DESIGNATOR	AS MODIFIED BY THICKNESS
DIAMETER	65.0 MILLIMETERS MINIMUM
LIGHT TRANSMISSION	TINTED
MATERIAL	BARIUM FLINT GLASS BIFOCAL
MATERIAL	GLASS SODA-LIME SINGLE VISION
PART NAME ASSIGNED BY CONTROLLING AGENCY	LENS BLANK OPHTHALMIC SEMIFINISHED BIFOCAL PLUS 8.25 PLUS 1.50
NONDEFINITIVE SPEC/STD DATA	1 TYPE AND A CLASS
READING SEGMENT DIAMETER	25.0 MILLIMETERS NOMINAL
READING SEGMENT HEIGHT	17.5 MILLIMETERS NOMINAL
STYLE DESIGNATOR	ROUND WITH STRAIGHT TOP BIFOCAL SEGMENT
THICKNESS	4.0 MILLIMETERS NOMINAL
TINTED AREA LIGHT TRANSMITTANCE IN PERCENT	31.0

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