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Corneal Pachymetry A pachymeter is a device that uses ultrasound to determine the thickness of the cornea in any given location. Pachymetry is an essential measurement prior to certain refractive surgical procedures, such as LASIK. Procedures such as LASIK remove tissue from the cornea and, therefore, pachymetry is important to be certain that the cornea will retain enough central tissue thickness to prevent ectasia, an abnormal "bowing" of thin corneas. Recently, the Ocular Hypertension Treatment Study was completed and presented valuable information regarding the relative thickness of the cornea and diagnosis of glaucoma. The Ocular Hypertension Treatment Study demonstrated that there is a relative impact of corneal thickness to the applanation tonometry readings commonelly accepted. Patients with ocular hypertension and increased corneal thickness have only apparent increased intraocular pressure, as opposed to true, elevated intraocular pressure. Conversely, decreased corneal thickness has been measured in patients with normal-tension glaucoma. The implication of several studies have indicated that corneal thickness cannot be ignored in the diagnosis and management of glaucoma. Goldmann applanation tonometry is only one method for measuring intraocular pressure, as the relationship to the corneal thickness has additional implications. Dr Anderson will use applanation tonometry values corrected for central corneal thickness to obtain a better estimate of the true intraocular pressure and the relative risk for glaucoma. Ocular Coherence Tomography is on the cutting edge of technology. The OCT3 is a diagnostic imaging device that provides direct cross sectional images of the retina for objective measurement and subjective clinical evaluation in the detection of glaucoma and retinal diseases. The OCT3 images and analyzes macular thickness, the retinal nerve fiber layer and the optic disc using the latest technology for high resolution scans. Pachymetry is a valuable adjunct in the diagnosis of glaucoma and helps clarify the role of intraocular pressure in the pathogenesis of glaucomatous optic nerve damage. Indeed, performing pachymetry may influence the management of all patients by allowing Dr. Anderson to (1) observe or pursue less aggressive treatment of patients with pseudo-ocular hypertension, (2) modify the target intraocular pressure in patients with glaucoma; and (3) detect an elevated intraocular pressure in otherwise normal patients with thin corneas and "normal" applanation readings. The measurement of corneal thickness reinforces the concept of glaucoma as a disease of the optic nerve, not one of just intraocular pressure. Primary eye care | Contacts | Glasses | Order contacts online Laser corrective surgery | Keratoconus | Free articles & information Home | Office info | Appointment request form Contact us | Privacy practices Village Optical: In town
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