Japanese Journal of Ophthalmology

, Volume 57, Issue 1, pp 85–89 | Cite as

Corneal biomechanical properties in eyes with no previous surgery, with previous penetrating keratoplasty and with deep anterior lamellar keratoplasty

  • Banu Torun AcarEmail author
  • Mehmet Orcun Akdemir
  • Suphi Acar
Clinical Investigation



To compare the biomechanical properties of the cornea in eyes with no previous surgery, with keratoconus with previous penetrating keratoplasty (PK) and with keratoconus with previous deep anterior lamellar keratoplasty (DALK) using the Reichert Ocular Response Analyzer (ORA).


One hundred twenty eyes of 120 patients were included in this prospective comparative study. Forty eyes were with no previous ocular surgery (group 1), 40 eyes were with previous PK for keratoconus (group 2), and 40 eyes were with previous DALK for keratoconus (group 3). Corneal hysteresis (CH) and the corneal resistance factor (CRF) were measured with ORA.


The CH and CRF values in group 2 were significantly lower than in group 1 and group 3 (p = 0.001). The CH and CRF values were similar in group 1 and group 3. There was no statistically significant difference between group 1 and 3.


Although the post-PK keratoconus cornea has weaker biomechanical properties, post-DALK keratoconus cornea is similar to normal cornea. A cornea weakened by keratoconus can be strengthened with lamellar keratoplasty.


Corneal hysteresis Corneal resistance factor Deep anterior lamellar keratoplasty Keratoconus Penetrating keratoplasty 


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Copyright information

© Japanese Ophthalmological Society 2012

Authors and Affiliations

  • Banu Torun Acar
    • 1
    Email author
  • Mehmet Orcun Akdemir
    • 2
  • Suphi Acar
    • 1
  1. 1.Ophthalmology Clinic, Department of OphthalmologyHaydarpasa Numune Education and Research HospitalIstanbulTurkey
  2. 2.Ophthalmology ClinicErzurum Education and Research HospitalErzurumTurkey

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