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DESCRIPTION
The Boston
®
EQUALENS
Contact Lens material, oprifocon A, for daily wear
or extended wear is composed of methyl-methacrylate-
fluoroitaconate-siloxanyl copolymer with an ultravi-
olet absorber (Uvinul D-49). The lenses are available
in clear (untinted), blue, or green. The tinted lenses
contain the following color additives:
Color
Color Additive
Blue
D&C Green No. 6
Green
D&C Green No. 6
D&C Yellow No. 18
The Boston EQUALENS Contact Lens is a hemi-
spherical shell of the following dimensions:
Spherical Lens Design
Power Range
Diameter
Base Curve Range
Aspherical Lens Designs
(Some of these designs are patented;
manufacture of these lenses in Boston EQUALENS II
(oprifocon A) materials are authorized to
licensed labs only)
Power Range
Diameter
Base Curve Range
Toric Lens Designs (Daily Wear)
Power Range
Diameter
Base Curve Range
Toricity
Bifocal/Multifocal Lens Designs (Daily Wear)
(Some of these designs are patented;
manufacture of these lenses in Boston EQUALENS II
(oprifocon A) materials are authorized to
licensed labs only)
Power Range
Diameter
Base Curve Range
Segment Position
Add Powers
Prism Ballast
Scleral Lens Designs (Daily Wear)
(Each clear tinted lens is designed to rest on
the external sclera and vault the cornea and
limbus thereby enclosing a compartment filled
with sterile, buffered non-preseved saline solu-
tion, which provides an aqueous environment
for and virtually neutralizes the optics of the
corneal surface.)
Power Range
Diameter
Normalized Vaults
®
II Rigid Gas Permeable
-20.00D to +20.00D
(daily wear)
-20.00D TO +12.00D
(extended wear)
in 0.25D increments
7.0 mm to 11.5 mm
5.00 mm to 9.00 mm
in 0.01 mm increments
-20.00D to +20.00D
(daily wear)
-20.00D TO +12.00D
(extended wear)
in 0.25D increments
7.0 mm to 11.5 mm
6.00 mm to 9.20 mm
in 0.01 mm increments
-20.00D to +20.00D
in 0.25D increments
7.0 mm to 11.5 mm
6.80 mm to 9.50 mm
in 0.05 mm increments
Up to 9.00 Diopters
-20.00D to +12.00D
in 0.25D increments
8.5 mm to 11.5 mm
6.30 mm to 9.50 mm
in 0.01 mm increments
-2.00 mm to +1.00 mm
in 0.1 mm increments
+1.00D to +3.75D
in 0.25D increments
0.5 to 3.5 prism diopters
in 0.5D increments
-25.00D to +35.00D
in 0.25D increments
16 mm to 26 mm
± 0.25 mm
2.50 mm to 6.00 mm
± 0.1 mm
The lenses described above can have a center thick-
ness of 0.07 to 0.65 mm that will vary with lens
design, power and diameter.
The physical/optical properties of Boston
EQUALENS II GP Material are:
Specific Gravity
Refractive Index
Light Absorption (640 nm)
Light Absorption (640 nm)
(Absorbance Units/Inch)
Surface Character
Wetting Angle
Water Content
Oxygen Permeability
* Polymer Technology, Gas to Gas Method
{ x 10
-11
(cm
2
/sec) (mL O
**Polarographic Method (ISO/Fatt)
200
300
400
BOSTON EQUALENS II - 0.07 mm thick Boston
EQUALENS II (Clear) Contact Lens/Material.
CORNEA - Human cornea from a 24-year-old person
as described in Lerman, S., Radiant Energy and the
Eye, MacMillan, New York, 1980, p. 58.
CRYSTALLINE LENS - Human crystalline lens from
a 25-year-old person as described in Waxler, M.,
Hitchins, V.M., Optical Radiation and Visual Health,
CRC Press, Boca Raton, Florida, 1986, p. 19, figure 5.
NOTE
Long term exposure to UV radiation is one of the
risk factors associated with cataracts. Exposure is
based on a number of factors such as environmen-
tal conditions (altitude, geography, cloud cover)
and personal factors (extent and nature of outdoor
actitivies). UV-absorbing contact lenses help pro-
vide protection against harmful UV radiation.
However, clinical studies have not been done to
demonstrate that wearing UV-absorbing contact
lenses reduces the risk of developing cataracts or
other eye disorders. Consult your eye care prati-
tioner for more information.
WARNING
UV-absorbing contact lenses are NOT substitutes
for protective UV-absorbing eyewear such as UV-
absorbing goggles or sunglasses. Persons should
continue to use their protective UV-absorbing
eyewear as directed.
ACTIONS
The Boston EQUALENS II Contact Lens when placed
on the human cornea, acts as a refracting medium
to focus light rays on the retina to improve visual
acuity. The toric lens provides a more even surface
over the highly uneven astigmatic cornea and thus
helps to focus light rays on the retina.
1.24
1.423
10.0
Blue
4.8
Green
Hydrophobic
30°
<1%
127* (85**)
x mmHg) ) @ 35° C}
2
EQUALENS II
500
600
700
800
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