How to calculate piggyback IOL?

For minus (myopic) refractions, multiply the spherical equivalent by 1.2 to determine the piggyback IOL power. For plus (hyperopic) refractions, multiply the spherical equivalent by 1.5 to determine the piggyback IOL power.

What is a piggyback IOL?

The piggyback technique classically consists on the implantation of both the primary and secondary IOL in the capsular bag. The piggyback technique with an Add-On IOL consists on the implantation of the primary IOL in the capsular bag and the secondary IOL in the ciliary sulcus.

Can a piggyback lens be removed?

Another advantage of a secondary piggyback IOL over IOL exchange is that the implantation of a secondary IOL is a reversible procedure, and if complications such as ILO, pupillary optic capture, pigment dispersion syndrome, or pigmentary glaucoma occur, the removal of piggyback IOL can be considered.

Which IOL formula that used for piggyback IOL?

For myopic refractive errors, the spherical equivalent is multiplied by 1.2 to calculate the necessary myopic piggyback IOL power. IOL power calculations can also be made using the Holladay R formula or the Refractive Vergence Formula first described by Jack Holladay, MD, and popularized by Warren Hill, MD.

What is an Anisometropia?

Anisometropia is a condition where the refractive error differs between the two eyes. A difference in spherical equivalent refraction (SER) of 1 diopter or more (SER difference ≥ 1.00 D) is usually used as the definition for anisometropia.

What does Dysphotopsia look like?

Positive dysphotopsia typically presents with bright artifacts of light described as arcs, streaks, starbursts, rings, or halos. Negative dysphotopsia typically presents as dark, temporal arcing shadows or curtains (1).

What is Emmetropic phakic?

It is a surgical method for dealing with high refractive errors. It differs from refractive laser surgery for myopia, hyperopia and astigmatism as a lens is implanted in the eye without remodeling the cornea.

Who invented phakic?

Angle supported phakic IOLs were the first to be introduced by Jose Barraquer,4 modern designs were introduced and improved by Georges Beikoff,5 before they were withdrawn from the market due to late endothelial decompensation.

Can cataract lens be replaced more than once?

Our answer is yes. If there is an issue with your IOL, it can be replaced with another one. This usually occurs when the lens does not provide adequate vision correction or causes problems like double vision. However, patients should keep in mind that the need for revision is rare.