What is SRK formula?
What is SRK formula?
SRK formula”: P=A-2-5 L-009 K. A =A constant used with the original SRK formula. Al =Recommended A constant for use in calculating IOL power. LI =Axial length of the eye (in mm) preoperatively.
What is gullstrand ratio?
According to the Gullstrand schematic eye model, the anterior corneal radius, posterior corneal radius, and AP ratio (anterior corneal radius/posterior corneal radius) are 7.7, 6.8, and 1.13 mm, respectively.
How is IOL power calculated?
Modern instruments use separate sound velocities for the different eye components to obtain the total axial length. The measured transit time is converted to a distance using the formula d=t/v Where d is the distance, t is the time and v is the velocity. Two types of A-scan ultrasound biometry are currently in use.
What is a biometry test?
A biometry is an imaging technique that involves taking measurements of the eye. In this test we will measure the length of the eye and the curvature of the cornea (the clear window at the front of the eye), in order to calculate the lens strength.
What is UGH syndrome?
Uveitis-Glaucoma-Hyphema (UGH) Syndrome or Ellingson syndrome is a complication of intraocular chafing from intraocular lens (IOL) implants leading to a spectrum of iris transillumination defects and pigmentary dispersion to microhyphemas and hyphemas with elevated intraocular pressure (IOP).
What is Barrett Universal II formula?
The Barrett II Universal Formula uses a theoretical model in which the ACD is related to axial length and keratometry , but -unlike other formulas- the location of the principal plane of refraction of the IOL is retained as a relevant variable in the formula.
What does Pciol mean?
Posterior chamber intraocular lenses
Posterior chamber intraocular lenses (PCIOL) are placed within the capsular bag or less commonly anchored into the ciliary sulcus.
What is an Anisometropia?
What is Anisometropia? Anisometropia means that the two eyes have a different refractive power (glasses prescription), so there is unequal focus between the two eyes.
