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   Table of Contents      
LETTER TO THE EDITOR
Year : 2020  |  Volume : 68  |  Issue : 10  |  Page : 2322-2323

Are we treating the effect and neglecting the cause of keratoconus?


1 Associate Consultant, Cornea, Cataract and Refractive Surgeon, Centre for Sight, New Delhi, India
2 Consultant, Drishti Eye and Laser Centre, New Delhi, India

Date of Web Publication23-Sep-2020

Correspondence Address:
Dr. Lakshey Dudeja
Flat Number 14, Pragathisheel Apartment, Sector 9, Pocket 39, Rohini, New Delhi - 110 085
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/ijo.IJO_222_20

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How to cite this article:
Dudeja L, Dudeja I. Are we treating the effect and neglecting the cause of keratoconus?. Indian J Ophthalmol 2020;68:2322-3

How to cite this URL:
Dudeja L, Dudeja I. Are we treating the effect and neglecting the cause of keratoconus?. Indian J Ophthalmol [serial online] 2020 [cited 2020 Oct 24];68:2322-3. Available from: https://www.ijo.in/text.asp?2020/68/10/2322/295709



Dear Editor:

Are we really treating keratoconus correctly? What are the implications of the new concepts about our understanding of the disease?

Keratoconus is the most common primary ectasia usually occurring in the second decade of life. Early forms may go unnoticed but progressive forms can cause decrease in visual acuity not correctable with glasses.

It is suggested that Bowman's membrane might be the strongest biomechanical element of the human cornea followed by the anterior third of the corneal stroma.[1] New reports of Bowman's layer transplantation have shown evidence of reducing progression in cases with advanced keratoconus and have also shown to decrease keratometry values of bent cornea due to high tensile strength of the transplanted layer.[2],[3]

I wonder if keratoconus is a pathology of Bowman's layer and bending of corneal stroma is secondary to this pathology. Are we treating the effect of the disease and ignoring the cause? Corneal collagen cross-linkage with riboflavin increases cross-linkage in stroma and prevents it from further bending. Should our treatment be focused on corneal stroma or Bowman's layer?

This challenges even the diagnostic tools, which focus only on corneal topography. There are evidences of breaks in Bowman's layer in cases of keratoconus.[4] This highlights the need to shift our diagnostic strategy looking at other layers of cornea, rather than just looking at the final topographic changes.[5]

These made me think of another potential usefulness of this concept. Although most important factor deciding post-refractive surgery ectasia is residual stromal bed thickness, minimal alteration of Bowman's membrane in procedure such as SMILE can be an added advantage of this new emerging procedure.

I wanted to share my thoughts as I am still trying to figure out where exactly we stand in our understanding of “keratoconus.”

Financial support and sponsorship

Nil.

Conflicts of interest

There are no conflicts of interest.



 
  References Top

1.
Marshall J. The 2014 Bowman Lecture-Bowman's and Bruch's: A tale of two membranes during the laser revolution. Eye (Lond) 2015;29:46-64.  Back to cited text no. 1
    
2.
Van Dijk K, Liarakos VS, Parker J, Ham L, Lie JT, Groeneveld-van Beek EA, et al. Bowman layer transplantation to reduce and stabilize progressive, advanced keratoconus. Ophthalmology 2015;122:909-17.  Back to cited text no. 2
    
3.
Parker JS, Birbal RS, van Dijk K, Tong M, Ambati B, Baydoun L, et al. Bowman layer transplantation for advanced keratoconus. In: Adel Barbara, editor. Controversies in the Management of Keratoconus. Cham: Springer; 2019. p. 317-25.  Back to cited text no. 3
    
4.
Chi HH, Katzin HM, Teng CC. Histopathology of keratoconus. Am J Ophthalmol 1956;42:847-60.  Back to cited text no. 4
    
5.
Pahuja N, Shroff R, Pahanpate P, Francis M, Veeboy L, Shetty R, et al. Application of high resolution OCT to evaluate irregularity of Bowman's layer in asymmetric keratoconus. J Biophotonics 2017;10:701-7.  Back to cited text no. 5
    




 

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