Abstract
PURPOSE: Ectasia after laser in situ keratomileusis (LASIK) is a rare but serious complication. Prevention includes proper patient selection with detection of those at particular risk. Causes of ectasia include predisposition, excessive ablation with less than 250 μm of residual stromal bed, thicker than normal flap, irregular corneal thickness, and different ablation rates. METHODS: We evaluated corneal curvature patterns and their relationship to corneal topography and pachymetry maps. RESULTS: Corneal topography (axial, tangential, and altimetric) and pachymetry map characteristics of normally astigmatic corneas, keratoconus, false-positive and false-negative cases, as well as contact lens-induced warpage are discussed. CONCLUSIONS: Preoperative pachymetry maps for LASIK surgery allow accurate case selection through detection of borderline cases, and provide important documentation of preoperative status, as well as useful information for improving surgical strategy. Another important parameter is the asphericity index.
| Original language | English |
|---|---|
| Journal | Journal of Refractive Surgery |
| Volume | 17 |
| Issue number | 2 SUPPL. |
| Publication status | Published - 2001 |
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ASJC Scopus subject areas
- Ophthalmology
Cite this
Prevention of corneal ectasia in laser in situ keratomileusis. / Vinciguerra, P.; Camesasca, F. I.
In: Journal of Refractive Surgery, Vol. 17, No. 2 SUPPL., 2001.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Prevention of corneal ectasia in laser in situ keratomileusis
AU - Vinciguerra, P.
AU - Camesasca, F. I.
PY - 2001
Y1 - 2001
N2 - PURPOSE: Ectasia after laser in situ keratomileusis (LASIK) is a rare but serious complication. Prevention includes proper patient selection with detection of those at particular risk. Causes of ectasia include predisposition, excessive ablation with less than 250 μm of residual stromal bed, thicker than normal flap, irregular corneal thickness, and different ablation rates. METHODS: We evaluated corneal curvature patterns and their relationship to corneal topography and pachymetry maps. RESULTS: Corneal topography (axial, tangential, and altimetric) and pachymetry map characteristics of normally astigmatic corneas, keratoconus, false-positive and false-negative cases, as well as contact lens-induced warpage are discussed. CONCLUSIONS: Preoperative pachymetry maps for LASIK surgery allow accurate case selection through detection of borderline cases, and provide important documentation of preoperative status, as well as useful information for improving surgical strategy. Another important parameter is the asphericity index.
AB - PURPOSE: Ectasia after laser in situ keratomileusis (LASIK) is a rare but serious complication. Prevention includes proper patient selection with detection of those at particular risk. Causes of ectasia include predisposition, excessive ablation with less than 250 μm of residual stromal bed, thicker than normal flap, irregular corneal thickness, and different ablation rates. METHODS: We evaluated corneal curvature patterns and their relationship to corneal topography and pachymetry maps. RESULTS: Corneal topography (axial, tangential, and altimetric) and pachymetry map characteristics of normally astigmatic corneas, keratoconus, false-positive and false-negative cases, as well as contact lens-induced warpage are discussed. CONCLUSIONS: Preoperative pachymetry maps for LASIK surgery allow accurate case selection through detection of borderline cases, and provide important documentation of preoperative status, as well as useful information for improving surgical strategy. Another important parameter is the asphericity index.
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M3 - Article
VL - 17
JO - Journal of Refractive Surgery
JF - Journal of Refractive Surgery
SN - 1081-597X
IS - 2 SUPPL.
ER -