Background: The diagnosis of keratoconus in the early stages of the disease is necessary to initiate an early treatment of keratoconus. Furthermore, to avoid possible refractive surgery that could produce ectasias. This study aims to describe the topographic, pachymetric and aberrometry characteristics in patients with keratoconus, subclinical keratoconus and normal corneas. Additionally to propose a diagnostic model of subclinical keratoconus based in binary logistic regression models
Methods: The design was a cross-sectional study. It included 205 eyes from 205 patients distributed in 82 normal corneas, 40 early-stage keratoconus and 83 established keratoconus. The rotary Scheimpflug camera (Pentacam® type) analyzed the topographic, pachymetric and aberrometry variables. It performed a descriptive and bivariate analysis of the recorded data. A diagnostic and predictive model of early-stage keratoconus was calculated with the statistically significant variables
Results: Statistically significant differences were observed when comparing normal corneas with early-stage keratoconus/ in variables of the vertical asymmetry to 90º and the central corneal thickness. The binary logistic regression model included the minimal corneal thickness, the anterior coma to 90º and posterior coma to 90º. The model properly diagnosed 92% of cases with a sensitivity of 97.59%, specificity 98.78%, accuracy 98.18% and precision 98.78%
Conclusions: The differential diagnosis between normal cases and subclinical keratoconus depends on the mínimum corneal thickness, the anterior coma to 90º and the posterior coma to 90º.
Figure 1
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Posted 19 May, 2020
On 02 Jul, 2020
Received 29 May, 2020
Received 25 May, 2020
On 12 May, 2020
On 07 May, 2020
Invitations sent on 07 May, 2020
On 07 May, 2020
On 06 May, 2020
On 14 Jan, 2020
On 29 Apr, 2020
Received 14 Apr, 2020
Received 01 Apr, 2020
On 24 Mar, 2020
On 20 Mar, 2020
Invitations sent on 28 Feb, 2020
On 20 Jan, 2020
On 19 Jan, 2020
On 19 Jan, 2020
On 14 Jan, 2020
On 14 Jan, 2020
On 13 Jan, 2020
On 13 Jan, 2020
Posted 19 May, 2020
On 02 Jul, 2020
Received 29 May, 2020
Received 25 May, 2020
On 12 May, 2020
On 07 May, 2020
Invitations sent on 07 May, 2020
On 07 May, 2020
On 06 May, 2020
On 14 Jan, 2020
On 29 Apr, 2020
Received 14 Apr, 2020
Received 01 Apr, 2020
On 24 Mar, 2020
On 20 Mar, 2020
Invitations sent on 28 Feb, 2020
On 20 Jan, 2020
On 19 Jan, 2020
On 19 Jan, 2020
On 14 Jan, 2020
On 14 Jan, 2020
On 13 Jan, 2020
On 13 Jan, 2020
Background: The diagnosis of keratoconus in the early stages of the disease is necessary to initiate an early treatment of keratoconus. Furthermore, to avoid possible refractive surgery that could produce ectasias. This study aims to describe the topographic, pachymetric and aberrometry characteristics in patients with keratoconus, subclinical keratoconus and normal corneas. Additionally to propose a diagnostic model of subclinical keratoconus based in binary logistic regression models
Methods: The design was a cross-sectional study. It included 205 eyes from 205 patients distributed in 82 normal corneas, 40 early-stage keratoconus and 83 established keratoconus. The rotary Scheimpflug camera (Pentacam® type) analyzed the topographic, pachymetric and aberrometry variables. It performed a descriptive and bivariate analysis of the recorded data. A diagnostic and predictive model of early-stage keratoconus was calculated with the statistically significant variables
Results: Statistically significant differences were observed when comparing normal corneas with early-stage keratoconus/ in variables of the vertical asymmetry to 90º and the central corneal thickness. The binary logistic regression model included the minimal corneal thickness, the anterior coma to 90º and posterior coma to 90º. The model properly diagnosed 92% of cases with a sensitivity of 97.59%, specificity 98.78%, accuracy 98.18% and precision 98.78%
Conclusions: The differential diagnosis between normal cases and subclinical keratoconus depends on the mínimum corneal thickness, the anterior coma to 90º and the posterior coma to 90º.
Figure 1
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