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   Table of Contents      
LETTER TO THE EDITOR
Year : 2019  |  Volume : 67  |  Issue : 1  |  Page : 177-178

Response to comment on: Optical coherence tomography angiography in acute unilateral nonarteritic anterior ischemic optic neuropathy: A comparison with the fellow eye and with eyes with papilledema


1 Neuro-Ophthalmology Services, L. V. Prasad Eye Institute, Kallam Anji Reddy Campus, L.V. Prasad Marg, Banjara Hills, Hyderabad, Telangana, India
2 Smt. Kanuri Santhamma Centre for Vitreo Retinal Diseases, L. V. Prasad Eye Institute, Kallam Anji Reddy Campus, L.V. Prasad Marg, Banjara Hills, Hyderabad, Telangana, India

Date of Web Publication21-Dec-2018

Correspondence Address:
Dr. Preeti P Chhablani
Neuro-Ophthalmology Service, L V Prasad Eye Institute, Kallam Anji Reddy Campus, Hyderabad - 500 034
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/ijo.IJO_1771_18

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How to cite this article:
Gandhi U, Chhablani J, Chhablani PP. Response to comment on: Optical coherence tomography angiography in acute unilateral nonarteritic anterior ischemic optic neuropathy: A comparison with the fellow eye and with eyes with papilledema. Indian J Ophthalmol 2019;67:177-8

How to cite this URL:
Gandhi U, Chhablani J, Chhablani PP. Response to comment on: Optical coherence tomography angiography in acute unilateral nonarteritic anterior ischemic optic neuropathy: A comparison with the fellow eye and with eyes with papilledema. Indian J Ophthalmol [serial online] 2019 [cited 2019 Aug 24];67:177-8. Available from: http://www.ijo.in/text.asp?2019/67/1/177/248136



Sir,

We thank Dr. Hayreh for his comments[1] on our study[2] and fully appreciate his volume of work and expertise on this subject.

Regarding some of the points raised – we agree that fundus fluorescein angiography (FFA) findings in non-arteritic anterior ischemic optic neuropathy (NAION) have been extensively reported and would like to explain that this study was not designed to compare optical coherence tomography angiography (OCT-A) with FFA or any other modality. It was aimed at trying to analyze the results of OCT-A in NAION, since it is a relatively new modality and a little is known about its utility in this disorder. Hence, we wish to clarify that we do not propose any new hypothesis regarding the pathophsiology of NAION based on this study, it would be very premature to do so since the technology and our understanding of OCT-A is still evolving. We do not claim to be the first to describe these findings and there are other studies which have tried to use OCT-A to delve deeper into the pathology of this disease[3],[4],[5] and we have cited them in the original article as well.

Visual fields are routinely tested using the Humphrey perimeter in everyday clinical practice and most studies on NAION[6] use this investigative modality. While we realize the inherent limitations of automated perimetry, we have described our visual field testing results based on the investigative modality available to us for routine use.

The terminology used to describe the vascular beds has been used in reference with the OCT-A and has been described in the methodology.

Again, we thank Dr. Hayreh for his interest in our article.

Financial support and sponsorship

Nil.

Conflicts of interest

There are no conflicts of interest.



 
  References Top

1.
Hayreh SS. Comment on: Optical coherence tomography angiography in acute unilateral nonarteritic anterior ischemic optic neuropathy: A comparison with the fellow eye and with eyes with papilledema. Indian J Ophthalmol 2019;67:176-7.  Back to cited text no. 1
  [Full text]  
2.
Gandhi U, Chhablani J, Badakere A, Kekunnaya R, Rasheed MA, Goud A, et al. Optical coherence tomography angiography in acute unilateral nonarteritic anterior ischemic optic neuropathy: A comparison with the fellow eye and with eyes with papilledema. Indian J Ophthalmol 2018;66:1144-8.  Back to cited text no. 2
[PUBMED]  [Full text]  
3.
Sharma S, Ang M, Najjar RP, Sng C, Cheung CY, Rukmini AV, et al. Optical coherence tomography angiography in acute non-arteritic anterior ischaemic optic neuropathy. Br J Ophthalmol 2017;101:1045-51.  Back to cited text no. 3
    
4.
Wright Mayes E, Cole ED, Dang S, Novais EA, Vuong L, Mendoza-Santiesteban C, et al. Optical coherence tomography angiography in nonarteritic anterior ischemic optic neuropathy. J Neuroophthalmol 2017;37:358-64.  Back to cited text no. 4
    
5.
Hata M, Oishi A, Muraoka Y, Miyamoto K, Kawai K, Yokota S, et al. Structural and functional analyses in nonarteritic anterior ischemic optic neuropathy: Optical coherence tomography angiography study. J Neuroophthalmol 2017;37:140-8.  Back to cited text no. 5
    
6.
Scherer RW, Feldon SE, Levin L, Langenberg P, Katz J, Keyl PM, et al. Ischemic Optic Neuropathy Decompression Trial Research Group. Visual fields at follow-up in the ischemic optic neuropathy decompression trial: Evaluation of change in pattern defect and severity over time. Ophthalmology 2008;115:1809-17.  Back to cited text no. 6
    




 

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