Acta Ophthalmologica 2015
Erratum
E
rratum for ‘Autorefraction versus subjective refraction in a radially asymmetric multifocal intraocular lens’ in Acta Ophthalmol. 2014: 92: 764–768
In van der Linden et al. (2014), an author’s name was misspelled. Rana El-Saady should have been Rana Al-Saady. We apologize for the error.
Reference van der Linden JW, Vrijman V, El-Saady R, van der Meulen IJ, Mourits MP & Lapid-Gortzak R (2014): Autorefraction versus subjective refraction in a radially asymmetric multifocal intraocular lens. Acta Ophthalmol 92: 764–768.
Letters to the Editor Is increased choroidal thickness associated with primary angle closure? H€ useyin Kaya,1 G€ okhan Pekel1 2 Evre Pekel 1 Ophthalmology Department, Pamukkale University, Denizli, Turkey; 2 Eye Clinic, Denizli State Hospital, Denizli, Turkey
doi: 10.1111/aos.12528
Editor,
W
ith great interest, we read the article ‘Is increased choroidal thickness associated with primary angle closure?’ (Zhou et al. 2014). The authors aimed to evaluate whether increased choroidal thickness is a risk factor for primary angle closure using enhanced depth optical coherence tomography in a specific Chinese population. They found that eyes with primary angleclosure glaucoma have a higher level of subfoveal choroidal thickness than normal eyes. We congratulate the authors for their excellent work. We would like to make some contributions and criticisms related to this study. Nowadays, the choroidal thickness measurement by enhanced depth optical coherence tomography is a hot topic in ophthalmology. Many studies
e82
have been reported in the literature about choroidal thickness in various physiological or disease conditions. As the choroid is utmost important for the proper functioning of outer retina, it deserves that interest. As we know, there are lots of factors that could affect subfoveal choroidal thickness such as age, axial length, ethnicity, systemic and retina–choroidal disorders, and several daily activities. These factors should be taken into consideration when conducting a study related to subfoveal choroidal thickness. It was reported that choroidal thickness decreases following cigarette smoking and coffee drinking at least for some hours (Sizmaz et al. 2013; Vural et al. 2014). Although there are not many studies related to the influence of drugs on choroid, it was found that choroidal thickness increases in response to systemic sildenafil (Kim et al. 2013). Also, there is significant diurnal variation of subfoveal choroidal thickness (Tan et al. 2012). In addition, gonioscopic examination alone and Valsalva manoeuver performed by the patient during the examinations might cause alterations in intra-ocular pressure and anterior chamber depth, and thus may affect the choroidal thickness. Finally, we wonder if the patients had undergone ocular massage as a first line treatment in the study group, because ocular massage may alter intra-ocular pressure, ocular blood flow and in turn choroidal thickness. We believe that addition of information about the above mentioned factors might help
us to reach more definitive conclusions in the present study.
References Kim DY, Silverman RH, Chan RV, Khanifar AA, Rondeau M, Lloyd H, Schlegel P & Coleman DJ (2013): Measurement of choroidal perfusion and thickness following systemic sildenafil (Viagra). Acta Ophthalmol 91: 183–188. € kerd€ onmez C, Pinarci EY, Sizmaz S, K€ ußcu Karalezli A, Canan H & Yilmaz G (2013): The effect of smoking on choroidal thickness measured by optical coherence tomography. Br J Ophthalmol 97: 601–604. Tan CS, Ouyang Y, Ruiz H & Sadda SR (2012): Diurnal variation of choroidal thickness in normal, healthy subjects measured by spectral domain optical coherence tomography. Invest Ophthalmol Vis Sci 53: 261–266. Vural AD, Kara N, Sayin N, Pirhan D & Ersan HB (2014): Choroidal thickness changes after a single administration of coffee in healthy subjects. Retina 34: 1223– 1228. Zhou M, Wang W, Huang W, Gao X, Li Z, Li X & Zhang X (2014): Is increased choroidal thickness association with primary angle closure? Acta Ophthalmol [Epub ahead of print].
Correspondence: G€ okhan Pekel, MD Ophthalmology Department Pamukkale University Denizli 20070 Turkey Tel: +902584440728 – 5785 Fax: +902582134922 Email: [email protected]
Erratum
E
rratum for ‘Autorefraction versus subjective refraction in a radially asymmetric multifocal intraocular lens’ in Acta Ophthalmol. 2014: 92: 764–768
In van der Linden et al. (2014), an author’s name was misspelled. Rana El-Saady should have been Rana Al-Saady. We apologize for the error.
Reference van der Linden JW, Vrijman V, El-Saady R, van der Meulen IJ, Mourits MP & Lapid-Gortzak R (2014): Autorefraction versus subjective refraction in a radially asymmetric multifocal intraocular lens. Acta Ophthalmol 92: 764–768.
Letters to the Editor Is increased choroidal thickness associated with primary angle closure? H€ useyin Kaya,1 G€ okhan Pekel1 2 Evre Pekel 1 Ophthalmology Department, Pamukkale University, Denizli, Turkey; 2 Eye Clinic, Denizli State Hospital, Denizli, Turkey
doi: 10.1111/aos.12528
Editor,
W
ith great interest, we read the article ‘Is increased choroidal thickness associated with primary angle closure?’ (Zhou et al. 2014). The authors aimed to evaluate whether increased choroidal thickness is a risk factor for primary angle closure using enhanced depth optical coherence tomography in a specific Chinese population. They found that eyes with primary angleclosure glaucoma have a higher level of subfoveal choroidal thickness than normal eyes. We congratulate the authors for their excellent work. We would like to make some contributions and criticisms related to this study. Nowadays, the choroidal thickness measurement by enhanced depth optical coherence tomography is a hot topic in ophthalmology. Many studies
e82
have been reported in the literature about choroidal thickness in various physiological or disease conditions. As the choroid is utmost important for the proper functioning of outer retina, it deserves that interest. As we know, there are lots of factors that could affect subfoveal choroidal thickness such as age, axial length, ethnicity, systemic and retina–choroidal disorders, and several daily activities. These factors should be taken into consideration when conducting a study related to subfoveal choroidal thickness. It was reported that choroidal thickness decreases following cigarette smoking and coffee drinking at least for some hours (Sizmaz et al. 2013; Vural et al. 2014). Although there are not many studies related to the influence of drugs on choroid, it was found that choroidal thickness increases in response to systemic sildenafil (Kim et al. 2013). Also, there is significant diurnal variation of subfoveal choroidal thickness (Tan et al. 2012). In addition, gonioscopic examination alone and Valsalva manoeuver performed by the patient during the examinations might cause alterations in intra-ocular pressure and anterior chamber depth, and thus may affect the choroidal thickness. Finally, we wonder if the patients had undergone ocular massage as a first line treatment in the study group, because ocular massage may alter intra-ocular pressure, ocular blood flow and in turn choroidal thickness. We believe that addition of information about the above mentioned factors might help
us to reach more definitive conclusions in the present study.
References Kim DY, Silverman RH, Chan RV, Khanifar AA, Rondeau M, Lloyd H, Schlegel P & Coleman DJ (2013): Measurement of choroidal perfusion and thickness following systemic sildenafil (Viagra). Acta Ophthalmol 91: 183–188. € kerd€ onmez C, Pinarci EY, Sizmaz S, K€ ußcu Karalezli A, Canan H & Yilmaz G (2013): The effect of smoking on choroidal thickness measured by optical coherence tomography. Br J Ophthalmol 97: 601–604. Tan CS, Ouyang Y, Ruiz H & Sadda SR (2012): Diurnal variation of choroidal thickness in normal, healthy subjects measured by spectral domain optical coherence tomography. Invest Ophthalmol Vis Sci 53: 261–266. Vural AD, Kara N, Sayin N, Pirhan D & Ersan HB (2014): Choroidal thickness changes after a single administration of coffee in healthy subjects. Retina 34: 1223– 1228. Zhou M, Wang W, Huang W, Gao X, Li Z, Li X & Zhang X (2014): Is increased choroidal thickness association with primary angle closure? Acta Ophthalmol [Epub ahead of print].
Correspondence: G€ okhan Pekel, MD Ophthalmology Department Pamukkale University Denizli 20070 Turkey Tel: +902584440728 – 5785 Fax: +902582134922 Email: [email protected]
