What Is Optic Decentration
In Ophthalmic Optics, the Term “Decentration” Refers to the Shift of the Crystalline Lens, an Intraocular Lens (Iol), a Corneal Refractive Treatment, a Contact...
In ophthalmic optics, the term “decentration” refers to the shift of the crystalline lens, an intraocular lens (IOL), a corneal refractive treatment, a contact lens, or the lens in a frame relatively to the visual axis.
How is Decentration of a lens calculated?
The total decentration can be calculated by subtracting the patient’s PD from the frame PD. This measurement assumes that the patient’s face is perfectly symmetrical. Monocular decentrations can be calculated by taking monocular PD measurements and subtracting from half the frame PD.
How does Decentration affect lens thickness?
What happens if decentration is zero? With an Rx of -8.00 sph in 1.50 plastic with 0 mm of decentration and a 2.0 mm center thickness, the lens has an edge thickness of 6.3 mm, a reduction of 33 percent from the original job. Decentration affected the lens thickness of this job the most.
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