Keratoconus, the most common corneal ectasia, is a progressive corneal Figure 8. Keratoconus on Pentacam. The anterior axial map shows. To assess the effect of age on elevation and pachymetric Pentacam keratoconus (KC) detection indices, and the need to adjust normative. Dr. Holladay says the changes ac-companying keratoconus are According to Dr. Holladay, the Pentacam, Galilei and Visante Omni all pick.

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This method corrects for the non-planar shape of the cornea and, thus, allows greater accuracy and resolution in creating a 3-D map of the cornea The Placido disc image shows concentric mires with some irregularity in the inferonasal region of the cornea. Enroll in the Residents and Fellows contest. The AS-OCT allows detailed measurements of the anterior chamber dimensions to assess whether or not sufficient anterior chamber space is available for one of these lens implants Figure 12 7.

The proposed cut-off points for these indices along with their sensitivity and specificity are presented in Table 5. Journal List J Curr Ophthalmol v. The advantage of INTACS is that they requrie no removal of corneal tissue, no intraocular incision, and leave the central cornea untouched.

This could be mentioned as a limitation of our study and should be interpreted with caution. This finding reaffirmed our suggestion of relying on pachymetric indices rather than elevation indices for extremes of age.

The OPD specifically detects the total refractive error in diopters in the eye, including aberrations in the cornea, lens and other structures, whereas the Internal OPD map captures the refractive error contributed by internal structures of the eye by subtracting the corneal refractive power from the total OPD.


Example of Early Keratoconus as evidenced on a Placido-disc based topographic evaluation.

Corneal Imaging: An Introduction

The reports contain a great deal of information, and samples of the overview report and the 4 maps report are provided below Figure 5A-B. The only sure way is to discontinue lens wear for a while and see what the cornea does.

Branching hyphae help confirm the diagnosis of Fusarium keratitis.

Placido images can help guide selective suture removal; for example, the sutures in C could be removed at 3 o’clock and 9 o’clock, clinical course permitting, to reduce the post-operative astigmatism.

Today, I believe anyone doing refractive surgery needs to have a ksratoconus for screening. By the time we get to age 60 or 70, it’s more like plastic. There is pentcaam a convenient summary of the keratometry, pachymetry, and other numeric measurements in this report.

Corneal Imaging: An Introduction

Posterior float, similar to the anterior float, shows the shape of the posterior cornea compared to a best-fit sphere. We excluded candidates with any detected corneal pathology, previous ocular surgery, contact lens wear within the last two weeks, or narrow palpebral fissure pfntacam proper imaging.

As corneal refractive surgery evolves, professional expectations increase and require continuous refinements of preoperative screening and interpretation [ 1 ].

Areas where the mires are more widely spaced are flatter. Clinical applications of corneal confocal microscopy. Khachikian and I published a study two years ago evaluating pachymetric asymmetry between fellow eyes,” he says.

For those beginning training in ophthalmology, the utilization of common diagnostic tests provides quicker and more accurate diagnosis and management of corneal diseases.

Standard intraocular lenses only contain spherical correction.

To receive penacam and publication updates for Journal of Ophthalmology, enter your email address in the box below. Performing laser refractive surgery on an individual who is in the early stages of keratoconus—or any other corneal thinning disorder—is a bad idea; the consequences of missing this disease can be devastating for both the patient and the surgeon.


The Power of Pachymetry.

Warmer colors represent steeper corneal curvature while cooler colors represent flatter areas. Frequently the topography will show progression of keratoconus from symmetric astigmatism to asymmetric astigmatism, followed by asymmetric astigmatism pattern with a skewed radial axis.

Pentacam top indices for diagnosing subclinical and definite keratoconus

A combination of pachymetric, topometric, and aberrometric indices was entered to the regression model to differentiate subclinical and normal cases.

Novel pachymetric parameters based on corneal tomography for diagnosing keratoconus.

Placido disc evaluation can also be used to guide suture removal following penetrating keratoplasty. A tangential, or instantaneous, map is very similar to an axial map.

Keratoconus diagnostic indices and some pachymetric indices are among the indices measured by Pentacam which were evaluated in this study in order to facilitate the diagnosis of this condition.

The diagnostic specificity and sensitivity of these indices, in comparison with clinical examination and McMahon criteria, were evaluated and compared with Receiver Operating Curve ROCand cut-off points were presented. The result is that the elevation on the front of the cornea is keratoocnus as great as the elevation on the back. A completely normal map would be all green.

These follow-up visits also allow for re-evaluations of contact lens fit and care.