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You have full access to this article via your institution. Download PDF TO THE EDITOR: We read the article by Zeng et al. who evaluated the use of intravitreal conbercept for treatment of

macular oedema, with great interest [1]. Despite reports of significant improvement in vision resulting from the use of monotherapy anti-VEGF agents in patients with macular oedema, it is

deemed relatively short term, with evidence of rebound macular oedema following discontinuation of treatment, it is therefore important to consider utilising combination therapy. In a pilot

study of 12 eyes in the LEAVO study, we recorded venous and arterial calibre change to month 24 and investigated associations with the number of injections. This study included fundus images

from 12 patients. Using colour fundus photographs of the 12 eyes from the baseline, months 12 and 24, retinal vascular calibre was recorded. Mean baseline CRVE and CRAE in the study eyes

were 159.4 μm (range 128–198 μm) and 76.8 μm (range 54–93 μm) respectively, with mean CRVE in the unaffected fellow eyes being 120 μm (range 115–145 μm). Mean CRVE decreased significantly in

all affected eyes (_p_ < 0.05) over the 24-month period, with a 33% average CRVE reduction. Much of the reduction was observed within the first 12 months, with 29% and 6% in the first

and second 12-month periods, respectively. Mean CRAE in treated eyes reduced by 10.6% to month 24 [2, 3]. Utilising the LEAVO protocol, treated eyes received a mean of 13 injections from

baseline to month 24. The number of injections showed a weak positive association with baseline CRVE and a weak negative association with percentage change in CRVE. A mean of 13 injections

were given to the five eyes with CRVE reductions of ≥40%, compared with 15 injections in three eyes with CRVE reductions of ≤25% and 18 injections in the single eye with a CRVE decrease

≤6.5% to month 24. This suggests that analysis of baseline and change in retinal venous calibre may help identify eyes that require ongoing therapy. Given the small sample size, the

associations with CRVE did not reach statistical significance but warrant further analysis, for both CRVO and macular oedema [4]. REFERENCES * Zeng HY, Liu Q, Li XX, Sun YX, Zhang ZJ.

One-year efficacy of intravitreal conbercept injection for macular oedema secondary to central retinal vein occlusion in Chinese patients. Eye. 2020;24:1–6. * Corvi F, Querques G, La Spina

C, Lattanzio R, Bandello F. Dynamic and static retinal vessel analyses in patients with macular edema secondary to retinal vein occlusion. Retina. 2015;35:2052–9. * Yilmaz Tugan B, Karabas

L, Ozkan B. Impact of intravitreal dexamethasone implant on vessel diameters in patients with retinal vein occlusion. J Ophthalmol. 2019;2:3982428. Google Scholar  * Moradi A, Sepah YJ,

Ibrahim MA, et al. READ-2 Investigators. Association of retinal vessel calibre and visual outcome in eyes with diabetic macular oedema treated with ranibizumab. Eye (Lond). 2014;28:1315–20.

Article  CAS  Google Scholar  Download references AUTHOR INFORMATION AUTHORS AND AFFILIATIONS * University of Leeds, Leeds, UK Yasmin Bakr & Martin McKibbin * Eye Clinic, St. James’s

University Hospital, Leeds, UK Mike Stockton & Martin McKibbin Authors * Yasmin Bakr View author publications You can also search for this author inPubMed Google Scholar * Mike Stockton

View author publications You can also search for this author inPubMed Google Scholar * Martin McKibbin View author publications You can also search for this author inPubMed Google Scholar

CORRESPONDING AUTHOR Correspondence to Yasmin Bakr. ETHICS DECLARATIONS CONFLICT OF INTEREST The authors declare that they have no conflict of interest. ADDITIONAL INFORMATION PUBLISHER’S

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CITE THIS ARTICLE Bakr, Y., Stockton, M. & McKibbin, M. Changes in venous calibre during intra-vitreal therapy for central retinal vein occlusion. _Eye_ 35, 1020 (2021).

https://doi.org/10.1038/s41433-020-0951-8 Download citation * Received: 25 March 2020 * Revised: 20 April 2020 * Accepted: 29 April 2020 * Published: 15 May 2020 * Issue Date: March 2021 *

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