Fitting individual progressive lens
The fitting of individual progressive lens needs the measurement of individual
data of the face and frames in situ.
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| Pupillary distance and hight of
the gaze |
Eye - glas distance |
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lens - face tilt |
Working or reading distance
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Progressives Free-form technology
Progress in progressives Free-form
technology is the latest topic in the ophthalmic marketplace. Everyone is
excited by the new and innovative lens technology.
Free-form technology is a logical extension of Design by Prescription,
pioneered by scientists at SOLA. Their free-form progressive lens design is
called SOLAOne, which uses high-tech computer-aided ray tracing technology to
deliver the most advanced progressive-lens technology on the market. It allows
the lens manufacturers to incorporate their specific design onto a lens blank
without having to compromise visual acuity, as seen with traditional
progressive lens designs.
Free-form technology virtually eliminates unwanted radial astigmatic error,
the most common cause of non-adaption in patients with presbyopia. Traditional
progressive lenses use one base curve to cover a number of prescriptions, which
will correct power errors with a specific prescription, but yields a compromise
with adjacent prescriptions within a given range.
The SOLAOne design allows presbyopic patients the ability to see at various
distances without residual image jump (base down prismatic effect), restrictive
focal lengths, or demarcation lines. SOLAOne employs aspherical curves across
the front surface of the lens (below the major reference point), while at the
same time a gradual decrease in the radius of curvature is used from the
distance portion to the near area. This results in a lens that has multiple
centers of curvature, which allows for multiple focus points.
Exactly what is the progressive corridor? Simply put, a corridor (umbilical
line), or gradual increase in plus varying conic sections (curves) from the
distance portion to the near portion of a progressive lens, creates additional
plus power. As the add power increases, positive radial astigmatic dioptric
power (plus cylinder) is introduced in the lens. The result is skewed
aberration toward the periphery of the lens.
Traditional progressive lenses have increased residual plus cylinder, which
creates the boundary or corridor, which is perceived by patients as a "busy"
sensation as their angle of gaze rotates toward the periphery of the lens below
the major reference point. Free-form technology helps eliminate excessive
unwanted radial astigmatism, which results in a wider intermediate and reading
area.
The corridor's length is the distance measured from the optical cross (not
the major reference point) to the near optical center. The gradual increase in
plus power through the corridor will determine the corridor's overall length.
SOLAOne Design by Prescription coupled with free-form technology allows for a
wide comfortable reading area with the clearest possible optics for distance.
Inter-pupillary distance (PD's)
Height cantering
Frame inclination
Eye-Lens distance
Frame bending
Sensor for inclination measurement, in
sitting or upright position ? We have the choice: thanks to this sensor, we
have extremely reliable results in both positions. The position of head of the
customer is measured and analyzed before centration. And it is then taken into
account automatically during the measurement of the data for the centration.
AO SOLA – SOLAOne HD and AO Easy HD
Overall design parameters and goals
SOLAOne and AO Easy HD use a proprietary optimization approach to create an
individual design based on the wearer’s combination of sphere power, cylinder
power, cylinder axis, add power, and frame dimensions. This avoids the power
errors found on conventional lens designs that result from the inherent
compromises of the base-curve delivery system.
Benefits
Larger areas of clear vision for each wearer. Lowest unwanted astigmatism for
each wearer. The bestrealization of the SOLAOne and AO Easy designs for each
wearer’s full prescription.
Lens materials
Both SOLAOne HD and AO Easy HD come in high index 1.67 and 1.67 Transitions®
and include Teflon® Clear Coat.
Rx Range
SOLAOne HD: +8.00D to
-12.00D; –4.00D cyl
Add: +1.00D to 3.50D
AO Easy HD: +8.00D to
-12.00D; –4.00D cyl
Add: +1.00D to 3.50D
Fitting requirements
No extra fitting measurements required. Measure as you would for a conventional
progressive with monocular PD’s. Minimum fitting height of 18mm.
Ordering process
Information needed: Include standard PAL and frame measurements.
Essilor Varilux® Ipseo
Overall design parameters and goals
Incorporate a patient’s physiological criteria through “Head/Eye Movement
Ratio” and a “Stability Coefficient” with specific prescription and fitting
parameters to create a progressive that is uniquely suited to the patient’s
visual dynamics.
Benefits
An individually calculated lens designed to meet the visual needs of the
patient integrating the frame dimensions, lifestyle, and visual behavior of the
patient. Both the progressive width and the peripheral gradient (hard/soft) is
individualized to the patient’s needs resulting in up to 30% less “swim”
beneficial for “head movers” and up to 60% wider clear field of vision for “eye
movers.”
Lens materials
Both SOLAOne HD and AO Easy HD come in high index 1.67 and 1.67 Transitions®
and include Teflon® Clear Coat.
Rx Range
+6.00D to-10.00D;
-4.00D cyl
Add: +0.75D to +3.50D
Fitting requirements
Using a CRP, take monocular PDs. Pre-adjust frame to 8-12° panto angle with a
vertex distance of between 12mm and 14mm. Measure fitting height (minimum of
14mm; three progressions used in the design, 14mm, 16mm, and 18 mm). Use the
Vision Print System™ to determine the H/E ratio (Head/Eye Movement and
Stability Coefficient).
Ordering process
Information needed: Provide standard PAL information plus H/E ratio and the
longest desired progression length depending upon the seg height in the chosen
frame.
Carl Zeiss Vision - Gradal®
Individual and Short
Overall design parameters and goals
Carl Zeiss Vision’s Gradal Individual and Gradal Short allow ECPs to
incorporate back vertex distance, pantoscopic angle, frame dimensions, and
actual near working distance into the lens design.
Benefits
Astigmatic errors virtually eliminated. Wider, clearer central visual fields.
Even greater improvements for patients whose measurements differ significantly
from average. Eliminates suboptimal power errors resulting from designs built
upon base curve system.
Lens materials
Gradal Individual and Gradal Short i are available in 1.6 high index, 1.67 high
index, and all jobs include Zeiss’ Carat® Advantage lens treatment.
Rx Range
Gradal Individual 1.67 index: +6.50D to -17.00D,
-4.00D cyl
Adds: +0.75D to 3.00D
Gradal Individual 1.60 index: +10.00D to –10.00D,
–6.00D cyl
Adds: +0.75D to 3.50D
Gradal Short i 1.6 index:
+6.00D to –6.00D cyl
Adds: +0.75D to 3.00D
Fitting requirements
Zeiss Gradal Individual and Gradal Short i will deliver excellent results using
standard fitting measurements and even better results with additional
measurements. ECPs may order these lenses simply by specifying monocular PD
frame type and measurements and by specifying Individual (for fitting heights
of 18mm or more) or Short i (for fitting heights of 15mm or more).
Additionally, dispensers can specify back vertex distance and pantoscopic angle
to achieve further individual optimization. Absent these measurements, standard
values are used. Dispensers can even specify zero inset for monocular patients
and the individual’s near working distance.
Ordering process
Information needed: Standard PAL and frame measurements, plus back vertex
distance, pantoscopic angle, and near working distance is desired.
Seiko Proceed® Internal
Overall design parameters and goals
Total control of off-center astigmatism and power errors inherent in lens
systems. Aspheric compensation for each sphere, cylinder, axis, and add
resulting in over two million optically correct designs.
Benefits
Controls off-center astigmatism and power errors. Significantly expands the
width of visual fields. Consistently wide near vision. Precise optical
correction for every individual prescription.
Lens materials
MR-10 1.67 high index, clear or Transitions V
Rx Range
+6.00D to -10.00D;
-4.00D cyl (to a total power of -10.00D) with HIP factory ARC
Add: +0.50D to 3.50D
Fitting requirements
Standard PAL fitting except on plus Rx’s. Minimum fitting heights of 16mm (12mm
corridor) or 18mm (14mm corridor).
HOYA Hoyalux iD
Overall design parameters and goals
Minimize distortions in PAL designs by placing vertical progressive components
on the front surface, concentrating skew distortions (horizontal components) on
the back surface, and the use of computer simulation to analyze
through-the-lens distortions at oblique angles.
Benefits
Balanced and more comfortable peripheral vision. Wide intermediate corridor.
More unlimited distortion-free areas. Perfect transition between far and near
vision. No swimming effects.
Lens materials
1.67 and 1.70 index with Super HiVision AR.
Rx Range
+6.00D to -10.00D;
–4.00D cyl with Super HiVision ARC
Add: 0.75D to 3.50D
Fitting requirements
Use standard PAL fitting techniques including a monocular PD. Optional near
working distance useful.
Ordering process
Information needed: Provide standard PAL information (including optional near
fitting distance). Frame A, B, and DBL plus lens shape is desired for optimal
calculations.
Shamir Autograph™
Overall design parameters and goals
The Autograph design starts with Shamir Insight, Inc.’s patented Eye-Point
Technology® which simulates human vision at every angle of vision and optical
zone. Prescriptor Software then captures individualized information such as
power, PD, frame measurements, vertex distance, and personal preferences to
calculate specific back surface design.
Benefits
Power calculations to an incredible 0.01 diopters. Enhanced, wider fields of
vision. Virtually eliminates unwanted astigmatism,swim, and peripheral
distortions.
Lens materials
CR-39 and SuperLife 1.60. Polycarbonate soon.
Rx Range
CR-39: +4.00D to -8.50D;
–4.00D cyl
Add: +0.75D to 3.50D
1.60: +6.00D to -10.00D:
–4.00D cyl
Add: +0.75D to 3.50D
Fitting requirements
Use standard PAL fitting techniques including a monocular PD. Vertex distance
is helpful; if not given, the calculations divert to a standard distance.
Minimum fitting height of 19mm.
Ordering process
Information needed: Provide standard PAL information. Frame A, B, and DBL plus
lens shape is desired for optimal calculations.
Nikon
Presio W
Designed to correct presbyopia, progressive lenses
ensure excellent near, intermediate and far vision, replacing unsightly
segmented bifocals.
Lens technology is constantly evolving and Nikon is at
the forefront with its flair for precision manufacturing and its development of
patented progressive designs. Nikon carries four progressive
series, each ahead of its time.
The technology shared by these lenses makes
them compatible with small frames for a global dynamic vision, a vastly
enhanced field of vision and an improved visual ergonomy – while almost
eliminating any adaptation period. This means that you, the wearer of Nikon
progressive lenses, will benefit instantaneously from the smooth and large
field of vision.
The world's first bi-aspheric progressive lens with proprietary back
surface Aberration Filter™- By far the most common complaint when it
comes to progressive lenses is distortion. People often mention blurriness and
difficult transitions from one visual zone to the next, both of which
significantly compromise wearer comfort. With Nikon's revolutionary Aberration
Filter™(''aberration'' being the optical term for distortion), new Nikon W is
specially engineered to eliminate such constraints, resulting in a spectacular
advance in performance over traditional progressive lenses.
How it works?
The front surface of any progressive lens naturally generates a certain amount
of distortion (because of curvature variations in power control, etc.). Nikon W
is the first progressive lens of its kind with a back surface Aberration Filter™
designed to compensate for such distortion.
The Nikon W Aberration Filter™ effectively nullifies the distortion caused
by the front of the lens.
The result : virtually distortion-free vision.
Benefits to you:
- A clearer, sharper image across the entire lens
- Virtually no distortion
- A significantly wider field of vision
- Greater visual comfort and adaptability
- An ultra-light, ultra-thin lens
Eyemade® Progressives lenses
Presbyopia is not an illness; it is a natural process
that affects many people over 40, when their eyes start loosing the capacity to
focus on near objects. Progressive lenses are the ideal solution for correcting
presbyopia while also ensuring perfect near, far and intermediate sight:
glasses that provide clear vision at all distances.
Most progressive lenses are based on standard designs
that are not fully personalised, which means that wearers have to adapt to
them. This is why Indo has developed the personalised EyeMADE® progressive
lenses that adapt to your unique and personal way of looking at things.
With your
personalised EyeMADE® progressive lenses, you are about to enter in an
exclusive world. Your new progressive lenses are unique and specially adapted
to you because they have been designed by your own eyes to guarantee total
satisfaction.
EyeMADE® is a revolution in the world of diagnosis, design and production of
personalised progressive lenses.
Designed by your eyes
thanks to the VISUAL MAP DEVELOPER®
Your EyeMADE® progressive lenses are
designed by your own eyes thanks to the parameters obtained with the VISUAL MAP
DEVELOPER®, an exclusive system that makes a real-time 3D record of the eyes
and head movements in all directions when you look at things.
The VISUAL MAP® is the chart of your
personal visual behaviour: it shows you the areas that are more frequently used
by your eyes.
Unique lenses made using
Free-form technology
Your EyeMADE® lenses are
made one by one, using the latest Free-form production technology. The surface
of each lens is done point by point and surfaced according to your VISUAL MAP®
to ensure optimised vision. Furthermore, each lens comes with your initials
engraved on them to provide you with an even greater guarantee of
personalisation.
Special features
Your EyeMADE® progressive
lenses are made of light, thin organic material with Natural treatment
(which includes scratch-resistant coating, hard coating and self-cleaning
effect that repels dirt, are easier to clean and stay clean longer) Make sure
you have the real thing: Indo lenses have a mark of authenticity that is only
visible when you breath on them. For further information, consult your
optician.
Accessories
Your EyeMADE®
progressive lenses come with a number of useful accessories:
-
And a DVD, where you will find further details about your lenses.
