Journal of Clinical Ophthalmology and Research

LETTER TO THE EDITOR
Year
: 2021  |  Volume : 9  |  Issue : 3  |  Page : 151-

Comment on “Effect of high myopia on macular thickness: An optical coherence tomography study in a tertiary care hospital, Karnataka, India”


Bharat Gurnani1, Kirandeep Kaur2,  
1 Department of Cornea and Refractive Services, Department of Pediatric Ophthalmology and Strabismus, Pondicherry, India
2 Aravind Eye Hospital and Post Graduate Institute of Ophthalmology, Pondicherry, IndiaPondicherry, India

Correspondence Address:
Bharat Gurnani
Aravind Eye Hospital, Puducherry
India




How to cite this article:
Gurnani B, Kaur K. Comment on “Effect of high myopia on macular thickness: An optical coherence tomography study in a tertiary care hospital, Karnataka, India”.J Clin Ophthalmol Res 2021;9:151-151


How to cite this URL:
Gurnani B, Kaur K. Comment on “Effect of high myopia on macular thickness: An optical coherence tomography study in a tertiary care hospital, Karnataka, India”. J Clin Ophthalmol Res [serial online] 2021 [cited 2022 May 16 ];9:151-151
Available from: https://www.jcor.in/text.asp?2021/9/3/151/326793


Full Text



Dear Editor,

Myopia is one of the most common eye conditions, the leading cause of visual impairment, and a significant source of social and economic burden.[1] In Asia (ages 18–24 years), the prevalence of high myopia (SE >–6.00 D) is 6.8%–21.6%, respectively.[2] We read the article by Choudhary et al.[3] published in “JCOR” with great interest. We would like to congratulate the authors for this interesting work and bringing out important results from the Indian population. The authors found that the macular thickness was significantly decreased in myopic eyes compared to emmetropic eyes. However, the central foveal thickness was significantly high in high myopes. This is well in correlation with earlier studies, and helps in understanding the effects on macular thickness while evaluating macular diseases or glaucoma based on associated refractive errors and the location of measurement. We have few important observations and suggestions for the study.

First, the mean age of patients in two groups has not been highlighted. Teberik and Kaya[4] in their study on high myopes found a negative correlation of choroidal thickness with age of patients. It will be interesting if authors can through light on their experience and any similar correlation of retinal thickness with age. The authors have mentioned this interesting study as a case–control study in abstract and nothing has been mentioned in the main manuscript. We suggest this study can be mentioned as a case–control prospective observational study.

It will be good if the definition of high myopia is clearly defined. The abstract mentions that patients with spherical equivalents ≥6D were included, but the methodology mentions myopia of ≥6D. Was axial length also used for deciding the inclusion/exclusion criteria? As patients with spherophakia/post buckle surgery can also present as high myopia. Moreover, conditions like myopic maculopathy, staphyloma, high intraocular pressures, amblyopia, previous intraocular surgery might also affect the accuracy of axial length measurements and thus affect the results. [4] It will be good to through light over such similar experience by authors during the study. As thirty eyes of thirty patients were included in each group, was laterality of eye predecided or randomly left or right eye was screened?

The best-corrected visual acuity (BCVA) in high myopes has not been mentioned in results. Did the authors found any correlation of BCVA with macular or foveal thickness?

Financial support and sponsorship

Nil.

Conflicts of interest

There are no conflicts of interest.

References

1Zheng YF, Pan CW, Chay J, Wong TY, Finkelstein E, Saw SM. The economic cost of myopia in adults aged over 40 years in Singapore. Invest Ophthalmol Vis Sci 2013;54:7532-7.
2Koh V, Yang A, Saw SM, Chan YH, Lin ST, Tan MM, et al. Differences in prevalence of refractive errors in young Asian males in Singapore between 1996-1997 and 2009-2010. Ophthalmic Epidemiol 2014;21:247-55.
3Choudhary A, Venkatesh RH, Jayashree MP, Surendrappa HD, Divya R, Darshini LM. Effect of high myopia on macular thickness: An optical coherence tomography study in a tertiary care hospital, Karnataka, India. J Clin Ophthalmol Res 2021;9:17-20.
4Teberik K, Kaya M. Retinal and choroidal thickness in patients with high myopia without maculopathy. Pak J Med Sci 2017;33:1438-43.