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3.3.4 Precautions for measurement
a) Handling the biometry probe in contact/immersion modes
Cornea
Biometry probe
)
)
Ultrasound media
)
(1)
)
(Fig. 1)
)
(2)
)
(Fig. 2)
)
Ultrasound media
)
(Fig. 3)
)
■
3-26
<Contact mode>
Directly apply the contact section of the biometry probe
perpendicularly to the center of the cornea.
<Immersion mode>
When the immersion attachment is not used
Apply the axial length probe perpendicular to the corneal center
where corneal protective media, etc. is applied.
Make sure that the clearance between the cornea and the contact
section of the axial length probe is approximately 2.0 – 5.0 mm.
When the immersion attachment is used
■
When putting the corneal protective media in the cup at
the tip of the immersion attachment, pay extreme attention
not to allow air to enter the cup.
If air is in the cup, measurement cannot be performed or
correct measurement cannot be obtained.
1)
Lightly apply the corneal protective media etc. to the contact section
(1) of the biometry probe and cover the probe with the immersion
attachment (Fig. 1).
2)
Put the corneal protective media (2) in the cup at the tip of the
immersion attachment until it rises slightly.
3)
Set the tip of the immersion attachment perpendicular to the center
of the cornea, referring to the biometry probe axis and visual axis.
The appropriate position is where the tip of the immersion
attachment does not contact the cornea (Fig. 3).
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