High Precision Biometry

High Precision Biometry Dr Vibha Dr Shekhar

Several values are required to calculate IOL Power ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Keratometery ,[object Object],[object Object],[object Object],[object Object]

Source of keratometry errors ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Repeat Keratometery If ,[object Object],[object Object]

A-Scan biometery/laser inferometery ,[object Object],[object Object],[object Object],[object Object],[object Object]

A-scan facts ,[object Object],[object Object],[object Object],[object Object]

Applanation A-scan Biometry ,[object Object],[object Object]

Applanation A-scan Biometry. ,[object Object]

Applanation A-scan Biometry ,[object Object]

The five basic limitations of applanation A-scan biometry are: ,[object Object],[object Object],[object Object],[object Object],[object Object]

Immersion A-scan Biometry. ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Immersion A-scan Biometry ,[object Object]

Accuracy of axial length by different machine +/- .01mm +/- 0.12mm +/- 0.24mm IOL Master Immersion A-scan Applanation A -scan

Do not throw away old ultrasound machine ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],IOL master ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Posterior staphyloma Silicone oil Pseudophakia 4++brunescent lens Central PSC plaque Vitreous hemorrhage Central corneal scar Immersion ultrasound

IOL FORMULA Ist generation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

IOL FORMULA 2 nd generation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

IOL FORMULA 3 rd generation ,[object Object],[object Object],[object Object],[object Object]

IOL FORMULA 4 th generation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

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

When capsular tear does not allow bag placement of the lens change IOL power for sulcus placement ,[object Object],[object Object],[object Object],[object Object]

Summary ,[object Object],[object Object],[object Object]

High Precision Biometry

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High Precision Biometry