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Instructions for Side by Side Printing
  1. Print the notecards
  2. Fold each page in half along the solid vertical line
  3. Cut out the notecards by cutting along each horizontal dotted line
  4. Optional: Glue, tape or staple the ends of each notecard together
  1. Verify Front of pages is selected for Viewing and print the front of the notecards
  2. Select Back of pages for Viewing and print the back of the notecards
    NOTE: Since the back of the pages are printed in reverse order (last page is printed first), keep the pages in the same order as they were after Step 1. Also, be sure to feed the pages in the same direction as you did in Step 1.
  3. Cut out the notecards by cutting along each horizontal and vertical dotted line
To print: Ctrl+PPrint as a list

25 notecards = 7 pages (4 cards per page)

Viewing:

LENSOMETRY

front 1

LOCKING LEVER

back 1

Used to raise or lower the position of the lensometer for user's height or posture.

front 2

ADJUSTABLE EYEPIECE

back 2

To view readings and callibrate lensometer as needed.

Must be callibrated before each user begins.

front 3

EYEPIECE RUBBER EYE CUP

back 3

Prevents light from coming in, allows for for more clear readings, protects the lens, and protects users eyewear.

front 4

CHROME KNURLED SLEEVE

back 4

Rotatates the recticle to move the prisim base into focus.

front 5

RETICLE

back 5

A series of numbered circles the user sees to measure the amount of prism as well as the direction of the base.

front 6

PRISIM COMPENSATING DEVICE

back 6

Used whenever a prism is of more than 5D is present.

front 7

LENS TABLE

back 7

Where the glasses and lens sit to ensure they are level and on axis.

front 8

LENS TABLE LEVER

back 8

To raise of lower the glasses or lens for OC heights or sitting positions.

front 9

LENS STOP

back 9

Where the back of the lens rests.

front 10

LENS HOLDER

back 10

Holds the lens in place again the lens stop. It is a spring loaded arm with a non-scratch piece called the GIMBAL, which rests and holds the lens in place.

front 11

LENS MARKER

back 11

Or SPOTTING DEVICE. Three spring loaded pins that horizontally mark the lenses to idenifiy OC and outer reference points.

front 12

POWER DRUM

back 12

Hand wheel with numbered scale from +20.00D to -20.00D used to detirmine the sphere and cylinder power of a lens, usually in .12 diopter steps. A spherical RX has one reading, a toric RX has two readings.

- Plus values turn wheel up or away from user

- Minus values turn wheel down or towards user

front 13

AXIS WHEEL

back 13

To measure the axis of the lens.

front 14

A LENSOMETER MEASURES

back 14

  • Sphere power
  • Cylinder power
  • Clyinder axis
  • Posistion of optical center
  • Amount of prisim
  • Direction of prisim base

front 15

BACK VERTEX POWER (BVP)

back 15

The reading when the glasses are positioned on the lensometer facing towards the user. The exception is when getting the lined bifocal or trifocal RX reading, the glasses are posistioned away from user.

front 16

STEPS TO CALIBRATE LENSOMETER FOR EACH USER

back 16

  1. Cover light source with piece of paper over lens stop where you would mount the lens.
  2. Look through the eyecup and turn the eyepiece until the reticle is in focus.
  3. Set the power wheel to a high minus power.
  4. Remove the paper and turn the power drum toward 0.00 until the light is focused.
  5. Verify that is the light is focused at 0.00. If not, repeat steps.

front 17

VERIFYING A LENS FROM A KNOWN RX

back 17

  1. Set lensometer to user.
  2. Ensure reticle is centered in prisim target.
  3. Verify higher power first to allow for better accuracy. You can read a false prism going from lower RX to higher RX.
  4. Set power drum to SP power on RX
  5. If CYL, position the axis wheel.
  6. If no CYL, all lines on the target should be in focus. If not rotate power drum until it becomes into focus and notate power.
  7. Observe SPH lines, they should be straight and unbroken. If not, rotate axis wheel until straight and unbroken and notate new axis.
  8. Rotate the power drum until the lines indicating the CYL power comes into focus and notate the reading on the power drum.
  9. The difference between the two powers you just notated are equal to the power of the CYL.

front 18

NEUTRALIZING A LENS FROM AN UNKNOW RX

back 18

  1. Set lensometer to user.
  2. Rotate power drum until the target come into sharp focus. If all the lines come into focus at same time the lens only contains a SP RX.
  3. Rotate the axis wheel and power drum simultaneously until the spherical lines come into focus and are straight and unbroken. Note the markings on the axis wheel and power drum.
  4. Rotate the power drum until lines indicating the CLY power come into focus and notate.
  5. The difference between those two powers are your CYL power.

front 19

PRACTICE - What is the RX?

1ST READING: +3.00

2ND READING: +2.00

AXIS: 70

back 19

+3.00 -1.00 x 70

front 20

PRACTICE - What is the RX?

1ST READING: -1.50

2ND READING: -2.25

AXIS: 0

back 20

-1.50 -0.75 Xx180

front 21

PRACTICE - What is the RX?

1ST READING: +.075

2ND READING: -1.00

AXIS: 121

back 21

+.75 -1.75 x121

front 22

READING A RETICLE WHICH IS DIVIDED INTO 4 QUADRANTS

RIGHT EYE

back 22

Q1= Nasal - Base Up/In

Q2=Temporal - Base Up/Out

Q3=Temporal - Base Down/Out

Q4= Nasal - Base Down/In

front 23

READING A RETICLE WHICH IS DIVIDED INTO 4 QUADRANTS

LEFT EYE

back 23

Q1= Temporal - Base Up/Out

Q2=Nasal - Base Up/In

Q3= Nasal - Base Down/In

Q4= Temporal - Base Down/Out

front 24

VERIFY A PROGRESSIVE RX ON A LENSOMETER

back 24

  1. Set lensometer to user.
  2. Set the distance power on power drum and clamp the lens to OC. Use the NL centration chard to ID the FH in relation to the FRP. The distance reference zone is indicated above that fitting cross.
  3. Calculate the near power of the lens by adding the ADD power and set the power drum and clamp the lens to the near power of the lens using the NL chart.
  4. Once you have verified the distance and reading powers are correct, you know the intermediate power will also be correct.

front 25

READING BIFOCAL LENSES IN A LENSOMETER

back 25

  1. Set lensometer to user.
  2. Follow distance power steps.
  3. Calculate he near power of the lens and set the power drum. Turn the glasses around so that now you can read the FRONT VERTEX POWER (FVP) and clamp the lens to the near power of the lens below the segment line.

If you are reading a PLUS power lens with an ADD power of +2.00 or more read the the lens using the BACK VERTEX POWER (BVP).