24/03/2024
Continuing the series of Scansys TA517 by MediWorks, today’s topic is about the Intraocular Pressure Correction Formula.
🌟The low intraocular pressure after excimer laser treatment of myopia is due to the thinning of the cornea and the decrease in corneal stiffness, not the true low intraocular pressure. Therefore, it is very important for doctors to grasp the patient's basic intraocular pressure.
🌟Correct the intraocular pressure value according to the corneal thickness and/or corneal curvature to obtain the most realistic intraocular pressure state of the patient, which is helpful to judge the abnormal intraocular pressure.
🌟The Dresdner method, Ehlers method, Orssengo/Pye method (need to manually enter intraocular pressure) and Shah method, all correct the intraocular pressure based on the thickness of the corneal apex.
• The IOP correction value of Dresdner method, Ehlers method, and Shah method is negatively correlated with corneal thickness;
• The correction value of the Orssengo/Pye method varies with the increase or decrease of the corneal thickness according to an exponential curve.
🌟The Kohlhaas method corrects IOP based on corneal thickness and corneal curvature.
• It is believed that the decrease in intraocular pressure after LASIK is not only related to the changes in the corneal thickness and the curvature of the anterior corneal surface, but also to the stability of the cornea, especially the stability of the flap.
After LASIK, Ehlers' method is recommended, and Dresden's formula is recommended to correct intraocular pressure for thin corneas, which is helpful for judging suspected glaucoma and abnormal intraocular pressure.