[Optical properties of the cornea after different modifications of penetrating keratoplasty].

PURPOSE Comparative analysis of optical properties of the cornea after different modifications of penetrating keratoplasty. MATERIAL AND METHODS The study included 56 patients (56 eyes) divided into three study groups according to the surgery technique. Group I included 17 patients (17 eyes) after one-piece mushroom keratoplasty, group II - 21 patients (21 eyes) after two-piece mushroom keratoplasty and group III - 18 patients (18 eyes) after penetrating keratoplasty. In addition to standard examination methods, before surgery and in the course of the follow-up all patients underwent software-powered corneal densitometry on the anterior segment analyzer (Pentacam HR, "Oculus", Germany), as well as an assessment of the degree and regularity of postoperative astigmatism. RESULTS Comparison of the obtained results revealed with a high degree of confidence higher values of the total specific light scattering after two-piece mushroom keratoplasty throughout the entire observation period (p<0.05). At the same time, there was no statistically significant difference in visual acuity between the three study groups (p>0.05). A statistically significant increase in the level of induced astigmatism was revealed after penetrating keratoplasty. CONCLUSION The observed increase in light scattering after two-piece mushroom keratoplasty does not lead to a decrease in visual acuity. The interface in the optical zone of the cornea formed by a microkeratome does not affect the degree and regularity of induced astigmatism.

[1]  M. Busin,et al.  5-year Outcomes of Converted Mushroom Keratoplasty from Intended DALK Mandate 9mm Diameter DALK as the Optimal Approach to Keratoconus. , 2020, American journal of ophthalmology.

[2]  Stephen J. Vincent,et al.  Scleral lens wear following penetrating keratoplasty: changes in corneal curvature and optics , 2020, Ophthalmic & physiological optics : the journal of the British College of Ophthalmic Opticians.

[3]  S. Trufanov,et al.  [One-piece mushroom keratoplasty outcomes]. , 2020, Vestnik oftalmologii.

[4]  A. Myagkov,et al.  Visual rehabilitation of patients with irregular cornea , 2019, The Eye.

[5]  S. Trufanov,et al.  [Modern modifications of penetrating keratoplasty with complex operative incision]. , 2019, Vestnik oftalmologii.

[6]  E. Sukhanova,et al.  [Refractive changes after different modifications of endothelial keratoplasty]. , 2019, Vestnik oftalmologii.

[7]  L. Hoffart,et al.  Post-keratoplasty astigmatism management by relaxing incisions: a systematic review , 2017, Eye and Vision.

[8]  Y. Nahum,et al.  Large (9 mm) Deep Anterior Lamellar Keratoplasty with Clearance of a 6-mm Optical Zone Optimizes Outcomes of Keratoconus Surgery. , 2017, Ophthalmology.

[9]  S E Avetisov,et al.  [Corneal transparency: anatomical basis and evaluation methods]. , 2017, Vestnik oftalmologii.

[10]  Sanjay V. Patel,et al.  Changes in Keratocyte Density and Visual Function Five Years After Laser In Situ Keratomileusis: Femtosecond Laser Versus Mechanical Microkeratome. , 2015, American journal of ophthalmology.

[11]  V. Scorcia,et al.  Ultrathin descemet's stripping automated endothelial keratoplasty with the microkeratome double-pass technique: two-year outcomes. , 2013, Ophthalmology.

[12]  A. Iovieno,et al.  Correction of Postkeratoplasty Ametropia in Keratoconus Patients Using a Toric Implantable Collamer Lens , 2013, European journal of ophthalmology.

[13]  H. Dua,et al.  Corneal densitometry as an indicator of corneal health. , 2012, Ophthalmology.

[14]  P. Böelle,et al.  Predicted long-term outcome of corneal transplantation. , 2009, Ophthalmology.

[15]  F. Matonti,et al.  Correction of postkeratoplasty astigmatism by femtosecond laser compared with mechanized astigmatic keratotomy. , 2009, American journal of ophthalmology.

[16]  Sanjay V. Patel,et al.  The effect of corneal light scatter on vision after penetrating keratoplasty. , 2008, American journal of ophthalmology.

[17]  S. Kaye,et al.  Outcomes of same-sizing versus oversizing donor trephines in keratoconic patients undergoing first penetrating keratoplasty. , 2008, Ophthalmology.

[18]  F. C. Lam,et al.  Traumatic wound dehiscence after penetrating keratoplasty—a cause for concern , 2007, Eye.