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LETTER TO THE EDITOR
Year : 2020  |  Volume : 68  |  Issue : 1  |  Page : 265

Response to comments on: Ocular surface status in patients with hemifacial spasm under long-lasting treatment with botulinum A toxin: A comparative fellow eye study


Department of Ophthalmology, S. Orsola-Malpighi University Hospital, University of Bologna, Bologna, Italy

Date of Web Publication19-Dec-2019

Correspondence Address:
Dr. Marco Pellegrini
Ophthalmology Unit, S. Orsola-Malpighi University Hospital, University of Bologna, Via Palagi 9, Bologna - 40138
Italy
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/ijo.IJO_2025_19

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How to cite this article:
Pellegrini M, Schiavi C, Taroni L, Sebastiani S, Bernabei F, Roda M, Moscardelli F, Giannaccare G. Response to comments on: Ocular surface status in patients with hemifacial spasm under long-lasting treatment with botulinum A toxin: A comparative fellow eye study. Indian J Ophthalmol 2020;68:265

How to cite this URL:
Pellegrini M, Schiavi C, Taroni L, Sebastiani S, Bernabei F, Roda M, Moscardelli F, Giannaccare G. Response to comments on: Ocular surface status in patients with hemifacial spasm under long-lasting treatment with botulinum A toxin: A comparative fellow eye study. Indian J Ophthalmol [serial online] 2020 [cited 2020 Jan 18];68:265. Available from: http://www.ijo.in/text.asp?2020/68/1/265/273222



Dear Sir,

First of all, we would like to thank you for the constructive comments [1] on our study on ocular surface status following botulinum A toxin.[2] The authors of the letter pointed out that since the adverse events of botulinum A toxin injection usually occur during the first period of treatment, it could be appropriate to divide our sample according to the number of injections received. Although we have already investigated the correlations between the ocular surface parameters and the duration of treatment, of course a further analysis based also on the number of injections may be of interest. The mean number of injections was 22.3 (range 2–53). The sample size was too small to create 3 different subgroups according to the number of injections, as suggested (6–12; 12–25; >25). Furthermore, we were also unable to create a control group with patients who received a number of injections comprised between 1 and 3, because they were only 4. Therefore, we divided overall patients into 2 groups: Those who received less than 25 injections (n = 14) and those who received 25 or more injections (n = 12). Tear osmolarity was significantly lower in patients who received less than 25 injections (291.6 ± 22.7 vs 309.3 ± 9.9 mOsm/L, P = 0.017). This result is in agreement with the correlation between tear osmolarity and the duration of treatment already found in our study. Conversely, we did not find any significant difference for tear film break-up time, Schirmer test, corneal sensitivity, corneal staining, and OSDI score between the two groups (all P > 0.05).

In conclusion, the relationship between the number of botulinum A toxin injections and the ocular surface changes is not fully clarified by our study and further prospective studies with larger sample size are required to elucidate this issue. The evaluation of other ocular surface parameters not investigated in this paper, such as Jones test, could provide further useful information.

Financial support and sponsorship

Nil.

Conflicts of interest

There are no conflicts of interest.



 
  References Top

1.
Singh M, Das S, Sangwan V. Comments on: Ocular surface status in patients with hemifacial spasm under long-lasting treatment with botulinum A toxin: A comparative fellow eye study. Indian J Ophthalmol 2020;68:264-5.  Back to cited text no. 1
    
2.
Pellegrini M, Schiavi C, Taroni L, Sebastiani S, Bernabei F, Roda M, et al. Ocular surface status in patients with hemifacial spasm under long- lasting treatment with botulinum A toxin: A comparative fellow eye study. Indian J Ophthalmol 2019;67:1405-9.  Back to cited text no. 2
    




 

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