Tomey UD-600, Operator'S Manual

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3-94
b) Setting of the eye type to be measured and the sound velocity for conversion
„ „ „ „ „
This function will be applied only on selected eye to be
measured (OD or OS). The setting for both eyes cannot
be changed automatically. The setting for each eye
should be properly selected, according to the conditions.
Select the eye type to be measured from the following four types
for the eye to be measured.
„ Normal
Select "Normal" for the eye of which lens nucleus is relatively
soft like an incipient cataract.
„
Dense cataract
Select "Dense cataract" if the lens nucleus of the eye to be mea-
sured is relatively hard like an overheated cataract and in case
its measurement is difficult with "Normal" due to the reflective
echo caused at the rear side of the crystalline lens.
„ Aphakic
Select "Aphakic" if the eye to be measured is an aphakic eye.
„ Pseudophakic
Select "Pseudophakic" if the eye to be measured is an IOL im-
planted eye.
In case of "Aphakic", no measurement of ""LENS" can be ob-
tained for "ACD", "LENS", and "Pseudophakic".
In case of "Dense Cataract", there is a case that the instrument
cannot detect the lens posterior wave due to multiple echoes
generated in the lens.
c
: Measured value is displayed.
U : May not be displayed.
Ú
: Not displayed.
The axial length calculation can be chosen from the method
using "average sound velocity" or "sectional sound velocity"
only in case an incipient cataract is selected as the type of the
eye to be measured.
Eye Type AXIAL ACD LENS
Normal
c c c
Dense
c c
U
Aphakic
c Ú Ú
Pseudophakic1,2,3
c c Ú
3.6 Biometry