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The portion of astigmatism that remains uncorrected or is newly induced after a surgical procedure (such as cataract surgery or LASIK) or after the fitting of a contact lens. It must be accounted for in the final prescription.
read more about residual astigmatism ...This term often refers specifically to astigmatism arising from the internal optical components of the eye, such as the crystalline lens, rather than the cornea (which is usually addressed by surgery or contact lenses).
After corneal procedures like LASIK, residual astigmatism may result from imperfect healing, biomechanical changes in the cornea, or pre-existing lenticular astigmatism.
When a patient wears a standard rigid gas permeable (RGP) contact lens, the lens corrects the corneal astigmatism by creating a new, spherical surface. Any remaining astigmatism is considered residual (or lenticular) and must be corrected using a toric over-refraction.
Yes. Any significant residual astigmatism will result in a blur or distortion that cannot be corrected with simple spherical spectacle lenses.
It is measured via a subjective manifest refraction, typically after the surgical procedure or while the patient is wearing the primary corrective lens (e.g., an RGP lens).
It can often be corrected with a secondary, minor laser enhancement procedure (retreatment) or by prescribing a spectacle lens to compensate for the remaining error.