Measurement of corneal curvature

Measurement of Corneal curvature Principle of Keratometry Gauri S. Shrestha M.Optom, FIACLE

Keratometers ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Keratometers: uses ,[object Object],[object Object],[object Object],[object Object]

History ,[object Object],[object Object],[object Object],[object Object],[object Object]

Principle of Keratometry: Optical ,[object Object],[object Object],[object Object]

PRINCIPLES OF KERATOMETRY OPTICAL

PRINCIPLES OF KERATOMETRY OPTICAL ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Optical Principle of Keratometry ,[object Object],[object Object],[object Object],[object Object],[object Object]

DOUBLING PRINCIPLE ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

DOUBLING SYSTEMS ,[object Object],[object Object],[object Object],[object Object],[object Object]

DOUBLING SYSTEMS ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

DOUBLING SYSTEMS ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Instrumentation ,[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object]

Types of Keratometers ,[object Object],[object Object],[object Object],[object Object]

Types of Keratometers ,[object Object],[object Object],[object Object],[object Object],[object Object]

Keratometers Humphrey Keratometer B & L Keratometer

Javel’s keratometers : Varieties of Mires

[object Object],[object Object],Automated Keratometry

[object Object],[object Object],[object Object],[object Object],Automated keratometry

To expand the range of measurement ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

To expand the range of measurement ,[object Object],[object Object],[object Object],[object Object],[object Object]

Expanded ranges of Keratometer

Keratometry Calibration ,[object Object],[object Object],[object Object]

Keratometry ,[object Object],[object Object],[object Object]

CALIBRATION FORMULA ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Measurement ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Measurement ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Measurement ,[object Object],[object Object],[object Object]

Procedure ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Mires in keratometer Focusing keratometric target Locating the principle meridians Determining the corneal refractive power

PROBLEMS OF MEASUREMENT ,[object Object],[object Object],[object Object],[object Object]

SOURCES OF ERROR ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

SOURCES OF ERROR ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

PHOTOKERATOSCOPE/ PLACIDO DISK ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Placido Disc ,[object Object],[object Object]

Sun Nidek Photokeratoscope ,[object Object]

PHOTOKERATOSCOPE/ PLACIDO DISK ,[object Object],[object Object],[object Object],[object Object]

Images ,[object Object],[object Object],[object Object],[object Object]

Disadvantages of the Placido Disc ,[object Object],[object Object],[object Object],[object Object],[object Object]

Measurement of corneal curvature

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