| COMMON
SYMPTOMS |
High-Riding
Lens |
| Excellent near, excessive minus over-refraction
to achieve good distance. |
| |
|
| FITTING
GOAL |
|
| Lower the lens to pick up more distance power
in the center of the lens. |
| |
|
| REMEDY
PLUS LENSES (+) |
|
Steepen B.C. by 0.10mm
and/or
Decrease lens
diameter by 0.3mm
Last Alternative
Increase lens center thickness
by 0.05mm |
| |
|
| REMEDY
MINUS LENSES (-) |
|
Steepen
B.C. by 0.10mm
and/or
Decrease lens diameter
by 0.3mm
Last Alternative
Increase lens
center thickness by 0.05mm TOP
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|
|
|
| COMMON
SYMPTOMS |
Lens
Rides Temporally |
| Near is usually excellent, distance requires
additional -0.50D to -0.75D. |
| |
|
| FITTING
GOAL |
|
| Get lens to center more to pick up more distance
power in the center of the lens. |
| |
|
| REMEDY
PLUS LENSES (+) |
|
Increase
lens diameter by 0.3mm
and/or
Steepen B.C. by 0.10mm. |
| |
|
| REMEDY
MINUS LENSES (-) |
|
Increase
lens diameter by 0.3mm
and/or
Steepen B.C.
by 0.10mm. TOP
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|
|
|
| COMMON
SYMPTOMS |
Low-Riding
Lens |
| Good to excellent distance, near almost non-existent. |
| |
|
| FITTING
GOAL |
|
| Try
to achieve an upper lid attachment, making the greater plus
power on the periphery of the lens available
for near tasks. |
| |
|
| REMEDY
PLUS LENSES (+) |
|
Flatten B.C. by 0.10mm
and/or
Increase lens
diameter by 0.3mm and specify a minus carrier. |
| |
|
| REMEDY
MINUS LENSES (-) |
|
POWER < -4.00D
Flatten B.C. by 0.10mm
and/or
Specify a minus carrier. POWER >
-4.00D Flatten B.C. by 0.10mm
and/or
Reduce
lens diameter by 0.3mm. TOP
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|
|
|
| COMMON
SYMPTOMS |
Lens
That Centers |
| Excellent distance, reading is difficult. |
| |
|
| FITTING
GOAL |
|
| Get the lens to translate upward upon downward
gaze. |
| |
|
| REMEDY
PLUS LENSES (+) |
|
Flatten B.C. by 0.10mm
and/or
Increase lens
diameter by 0.3mm and specify a minus carrier.
|
| |
|
| REMEDY
MINUS LENSES (-) |
|
POWER < -4.00D
Flatten B.C. by 0.10mm
and/or
Specify
a minus carrier. POWER > -4.00D Flatten B.C. by
0.10mm
and/or
Reduce lens diameter by 0.3mm. TOP
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|
|
|
| COMMON
SYMPTOMS |
Lens
Rides Nasally |
| Distance is difficult and near vision is almost
non-existent. |
| |
|
| FITTING
GOAL |
|
| Must get lens to center as much as possible,
nasal displacement will never lead to good reading. |
| |
|
| REMEDY
PLUS LENSES (+) |
|
DIAMETER < 9.4mm
Increase
lens diameter by 0.3mm and specify a minus carrier.
DIAMETER
> 9.4mm
Specify
a minus carrier. |
| |
|
| REMEDY
MINUS LENSES (-) |
|
DIAMETER < 9.4mm
POWER < -4.00D
Increase
lens diameter by 0.5mm and specify a minus carrier.
POWER >
-4.00D
Increase lens diameter by 0.5mm.
DIAMETER > 9.4mm
POWER < -4.00D
Reduce
lens diameter by 0.5mm and specify a minus carrier.
POWER > -4.00D
Reduce lens diameter by 0.5mm. TOP
OF PAGE |
|
