Tomey AL-2000, Operator'S Manual

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AL-2000 Biometer & Pachymeter
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9 9..2 2 U Ullttrra asso ou un nd d vve ello occiittyy u usse ed d iin n a ax xiia all lle en ng gtth h m me ea assu urre em me en ntt
9 9..2 2 U Ullttrra asso ou un nd d V Ve ello occiittyy u usse ed d iin n A Ax xiia all L Le en ng gtth h M Me ea assu urre em me en ntt
9 9..2 2..1 1 N No orrm ma all
• Average ultrasound velocity: 1,550 m/s
• Average ultrasound velocity in the lens: 1,641 m/s
• Average ultrasound velocity in the anterior chamber: 1,532 m/s
Axial length is calculated using the following formula:
Where:
L: Axial length
V: Average ultrasound velocity
t: Time
9 9..2 2..2 2 D De en nsse e C Ca atta arra acctt
• Average ultrasound velocity: 1,548 m/s
• Average ultrasound velocity in the lens: 1,629 m/s
• Average ultrasound velocity in the anterior chamber: 1,532 m/s
Axial length is calculated using the same formula as for the normal lens.
9 9..2 2..3 3 A Ap ph ha ak kiicc
• Average ultrasound velocity: 1,532 m/s
Axial length is calculated using the same formula as for the normal lens.
9 9..2 2..4 4 P Psse eu ud do op ph ha ak kiicc
• Ultrasound velocity in IOL*:
Pseudophakic 1 - PMMA 2,718 m/s
Pseudophakic 2 - Silicon 1,049 m/s
Pseudophakic 3 - Acrylic 2,200 m/s
*Ultrasound velocity may vary between materials and manufacturers
and depending on temperature.
• Biometric ultrasound velocity: 1,532 m/s
• Average ultrasound velocity in the anterior chamber: 1,532 m/s
Axial length is calculated using the following formula:
Where:
Lp: Axial length
L: Axial length calculated with the biometric ultrasound velocity
Th: Central thickness of IOL (must be entered)
V
BIO
: Biometric ultrasound velocity
V
IOL
: Ultrasound velocity in the IOL (must be entered)