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Keratometer or
Ophthalmometer
LECTURE NO (#)
Definition:
 Measures radius of curvature of central cornea app
(3mm)
 One of the classic method for refraction, astigmatic
 Assesses curvature, Power and toricity of the cornea
 It may be used to asses the integrity of corneal/tear
surface
Keratometer or Ophthalmometer 3.pptx
Optical principle:
 The anterior corneal surface acts as a convex mirror
 Doubling system to obtain accurate measurement of
image size
 Keratometric formula
 Types:
1. Bausch & Lomb(adjust image size), one position
2. Javal Schoitz(adjust object size)two position
Keratometer or Ophthalmometer 3.pptx
Keratometer or Ophthalmometer 3.pptx
Basic components:
 Adjustable eyepiece
 Adjustable chin and forehead rest
 Knob to raise and lower the instrument
 Two power wheel to measure corneal power in each
meridian
 An axis scale
 Targets known as mires
 Joystick
Procedure:
 Focusing the eyepiece
 Adjust the instrument to the patient
 Aligning the instrument
 Instruct the patient
 Finding the primary meridians
 Taking the reading
 Recording the findings
Interpreting:
 R:42.00 at 180 ; 43.00 at 90
 L:42.25 at 170 ; 43.00 at 80
Interpretation:
 R: -1.00 x180
 L: -1.25 x170
 With the rule astigmatism 180
 Against the rule astigmatism 90
 Oblique astigmatism
Refractive astigmatism:
 Total astigmatism
 Increase with against the rule:
1. In the absence of corneal astigmatism -0.50 ag
2. In corneal -0.50 c rule no astig expected
3. If corneal -2.00 c refractive also -2.00 D c
4. If corneal -2.00D x the refractive -3.00 against
Indications:
Contact lens fitting
Keratoconus detection
48.00 or 50.00
Any question

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Keratometer or Ophthalmometer 3.pptx

  • 2. Definition:  Measures radius of curvature of central cornea app (3mm)  One of the classic method for refraction, astigmatic  Assesses curvature, Power and toricity of the cornea  It may be used to asses the integrity of corneal/tear surface
  • 4. Optical principle:  The anterior corneal surface acts as a convex mirror  Doubling system to obtain accurate measurement of image size  Keratometric formula  Types: 1. Bausch & Lomb(adjust image size), one position 2. Javal Schoitz(adjust object size)two position
  • 7. Basic components:  Adjustable eyepiece  Adjustable chin and forehead rest  Knob to raise and lower the instrument  Two power wheel to measure corneal power in each meridian  An axis scale  Targets known as mires  Joystick
  • 8. Procedure:  Focusing the eyepiece  Adjust the instrument to the patient  Aligning the instrument  Instruct the patient  Finding the primary meridians  Taking the reading  Recording the findings
  • 9. Interpreting:  R:42.00 at 180 ; 43.00 at 90  L:42.25 at 170 ; 43.00 at 80 Interpretation:  R: -1.00 x180  L: -1.25 x170  With the rule astigmatism 180  Against the rule astigmatism 90  Oblique astigmatism
  • 10. Refractive astigmatism:  Total astigmatism  Increase with against the rule: 1. In the absence of corneal astigmatism -0.50 ag 2. In corneal -0.50 c rule no astig expected 3. If corneal -2.00 c refractive also -2.00 D c 4. If corneal -2.00D x the refractive -3.00 against