Figure 22
For each eye, select the type of crystalline currently present:
Phakic: the patient has a natural crystalline lens.
Aphakic: the patient does not have any crystalline lens from birth or as a result of surgery.
Pseudophakic: the patient has an intraocular lens substituting the crystalline. In this case, it is very
important to also detail the type of material used by the surgeon:
o Unknown
o Silicon
o PMMA
o Acrylate
o Memory
The measured axial eye length depends on the measuring mode selected. Depending on the measuring mode
selected, Aladdin corrects the measurement with a constant defined as follows.
Aladdin device takes into consideration two conditions of the eye that can alter the measurement of axial
length:
- Vitreous body filled of silicone oil
- Implant of intra ocular lens
The difference of the measurement is caused by a different group refraction index considered in the
formula.
According to bibliographic data, the calculations have been performed to assess the amount of correction
that must be applied to correct the measurement in these special cases.
The correction data have been compared with predicate device assumptions and a table of corrections has
been elaborated as follows:
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