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Single Vision Lenses |
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A single vision lens is a mono visual lens yielding a single
field of vision; whether there is no prescription or a
single RX prescription. The three forms of single vision
lenses are plano, concave (minus prescriptions) and
convex (plus prescriptions). There are several different
materials to accommodate different needs, lifestyles and
prescriptions. View our
Materials/Mediums links for more information on
the technology available to accommodate patient needs
with lens materials. |
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Plano
(Non-Prescription) |
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Plano lenses are consistently the same thickness
throughout the lens. This anatomy of the lens yields no
prescription and is commonly used in all retail
sunglasses and eyeglasses that do not require a
prescription. |
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Concave Lens (Minus
Sphere) |
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Concave lenses are used to address nearsighted
correction, also referred to as
Myopia. Myopia
patients are usually identified with a minus diopter
sphere on an RX prescription. The anatomy of this lens
consists of a thinner center and thicker edge. The mass
of the edges on a concave lens is dictated by the
severity of the prescription. The higher the minus diopter sphere on the RX (prescription), the thicker the
edge will be. The lenses for minus prescriptions have a
flatter front base, hence yielding a flatter lens. For
this reason some minus prescriptions are hard to fit
into a wrap around frame (ie. sunglasses). |
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Appearance |
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Concave (minus sphere) lenses tend to de-magnify the
appearance of the eye making the eye look smaller than
normal. The higher
the myopic (minus) prescription the more notable the
de-magnification of the eye is, making the eye look
smaller
than normal. An
aspheric
lens should be considered,
especially with higher myopia (minus) prescriptions.
An aspheric lens will help create a thinner lens and a
more natural aesthetic appearance of the eye. However, even with an aspheric lens the eye may
still appear smaller than normal with higher myopia
(minus) prescriptions.
Standard center thickness of a lens is 2.2mm. However,
there are certain materials that can be surface to a
1.0mm center thickness, making the lens consistently
thinner.
There are other factors to consider, please consult your
Optician to comply with individual specifications.
Combining smaller frames with a higher index
lens (see
Materials/Mediums);
patients can achieve the thinnest lens possible for
their respective prescription. |
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Recommendation(s) |
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One common recommendation on high minus prescriptions is
a smaller frame. Considering that the closer to the
center you get on a concave lens the thinner the lens
is, hence the smaller the circumference of the eye size
of the eyeglass frame the thinner your lenses
potentially will be (see concave lens image below).
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Convex Lens (Plus Sphere) |
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Convex lenses are made to accommodate farsighted
patients, also referred to as
Hyperopia.
Hyperopia
patients are identified with a plus sphere on an RX
prescription. The anatomy of this lens is thicker in the
middle and thinner on the edges (see convex lens image
below). Convex (plus sphere) lenses have a curved front
base, yielding a curved lens that can accommodate many
frames styles. |
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Appearance |
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Convex (plus sphere) lenses tend to magnify the eye. The higher the plus prescription the
more notable the magnification of the eye is, creating a
bug eye or "Coke bottle" effect. An
aspheric
lens should be considered,
especially with higher hyperopia (plus) prescriptions.
An aspheric lens will help create a thinner lens and a
more natural aesthetic appearance of the eye for the
wearer. However, even with an aspheric lens the eye may
still appear larger than normal with higher hyperopia
(plus) prescriptions. |
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Recommendation(s) |
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The
higher the plus prescription the thicker the the
center will be. Considering the edge of the lens can be
as thin as a dull knifes edge, the center thickness
proportionally increases and decreases with the edge of
the lens. So the smaller the frame the thinner the
center thickness will be in ratio to the lenses edge.
The larger the frame the thicker the center thickness
will be in proportional ratio with the lenses edge (see
convex lens -side view image below). The Image
below represents the same prescription compared in a
larger and smaller frame. Another point to consider with convex (plus Sphere)
lenses is the higher the plus prescription the less recommendable
these lenses are for rimless (drill-mount) and semi-rimless (rimlon)
frames.
A rimless and semi-rimless lens has to have a designated
edge thickness to accommodate a groove, or girth to
sustain an elbow/temple of a drill mount frame.
Considering that the edges of the convex lens can be as
thin as a dull knifes edge; having to create a thicker edge
to accommodate a groove or drill mount frame increases
the overall thickness of the lens. Please refer to the "Convex
Lens-Side View" image below. The rimless cut out on
the larger frame should be compared to the smaller frame
in reference to the lens thickness comparison between a
full framed lens to a rimless framed lens. The rimless
edge may be thinner than the image portrayal, but
regardless will always be thicker than a full framed
lens. Again, this is only
to be considered on higher plus prescriptions. Consult
with your Optician for specific recommendations. |
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All images and
literature above are Copy written by Solis Inc. Any use
with out the written consent
of Solis Inc. is strictly prohibited. |
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All literature on
this website is strictly for reference. Specifications
for individual needs may vary. Please consult with a
doctor or licensed Optician to accommodate individual
needs. |
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