Cylinder Form In Lensometer

1
Cylinder Form In Lensometer

• Review all other material in Chapter 2 and
  Chapter 10 first!

2
If this was easy

• If you think that lensometer skills should be an
  easy thing to learn then you are mistaken
• If a monkey could do it then we would not need
  opticians and you would make 4.00 an hour!

3
Rx in minus cylinder form as written by doctor
and as written on lab work order

• R -1.00 -1.00 Axis 67
• L -1.00 -1.00 Axis 67

4
Review ---For verification in lensometer

• Axis wheel set to 67
• First drum reading will be -1.00
• Second drum reading will be -2.00
• Drum traveled 1.00 D more minus
• Rx is correct

5
Axis set at 67
6
First drum reading -1.00
7
What you see in lensometer at -1.00

• These are what sphere lines look like
• Three parallel lines that appear unbroken
• This tells you that the lens is on axis

8
What you do not want to see

• These are what broken sphere lines look like.
• This means the lens is off axis.
• Assuming the glasses are placed correctly on the
  spectacle table

9
Second drum reading -2.00
10
What you want to see in the lensometer at -2.00

• These are what cylinder lines look like
• Axis wheel is not touched!

11
From -1.00 to -2.00 is 1.00 D More Minus
12
Rx in plus cylinder form as written by doctor and
as written on lab work order

• R -2.00 1.00 Axis 157
• L -2.00 1.00 Axis 157

13
Review --- For verification in lensometer

• Axis wheel set to 157
• First drum reading will be -2.00
• Second drum reading will be -1.00
• Drum traveled 1.00 D more plus
• Rx is correct

14
Axis set at 157
15
First drum reading -2.00
16
What you see in lensometer at -2.00
17
What you do not want to see
18
Second drum reading -1.00
19
What you want to see in the lensometer at -1.00

• These are what cylinder lines look like

20
From -2.00 to -1.00 is 1.00 D More Plus