To compare horizontal strabismus deviation as assessed from photographs with that in the strabismus clinic using the prism bar.
Journal
Indian journal of ophthalmology
ISSN: 1998-3689
Titre abrégé: Indian J Ophthalmol
Pays: India
ID NLM: 0405376
Informations de publication
Date de publication:
01 Aug 2024
01 Aug 2024
Historique:
received:
08
02
2023
accepted:
25
03
2024
medline:
30
7
2024
pubmed:
30
7
2024
entrez:
30
7
2024
Statut:
ppublish
Résumé
To compare the deviation in cases of horizontal strabismus as assessed from photographs with the measurements as obtained in the strabismus clinic. After obtaining informed consent, we recruited subjects with manifest horizontal strabismus. We took a frontal flash photograph from a distance of 50 cm using smart-phone-based cameras with the flash light vertically aligned with the lens. After projecting the photograph on a laptop and using a vernier caliper, we measured the horizontal corneal diameter of the non-strabismic eye and the decentration of reflex in the strabismic eye taking limbus as the reference point. We converted these values to degrees by using a conversion factor of 7.5°/mm and further to prism diopters (PD) by the standard mathematical formula 100*tanθ. We included 74 subjects aged between 5 and 40 years with manifest horizontal deviation from 20 to 85 PD. We found a statistically significant correlation of 82.6% (P value < 0.001) between the clinic and photographic measurements. Agreement analysis suggested that the photographic measurements measured on average 7 PD less (95% confidence interval: 4.6 to 9.2) than clinical measurements along all values of misalignment, although the difference between the two methods decreased as the quantum of deviation increased. Linear regression revealed an r2 of 68% and provided a predictive equation to derive clinic equivalent measurements from photographic estimates. We believe our simple method provides robust evidence that a photographic estimation can provide the basic information of the size of the deviation to plan possible surgeries, especially in situations of a tele-consultation. This is an easy approach to both understand and master and should form the armamentarium of most orthopticians and strabismologists.
Identifiants
pubmed: 39078965
doi: 10.4103/IJO.IJO_409_23
pii: 02223307-202472080-00022
doi:
Types de publication
Journal Article
Comparative Study
Langues
eng
Sous-ensembles de citation
IM
Pagination
1199-1203Informations de copyright
Copyright © 2024 Copyright: © 2024 Indian Journal of Ophthalmology.
Références
Chia A, Dirani M, Chan Y, Gazzard G, Au Eong KG, Selvaraj P, et al. Prevalence of amblyopia and strabismus in young Singaporean Chinese children. Invest Ophthalmol Vis Sci 2010;51:3411–7.
Jackson S, Harrad R, Morris M, Rumsey N. The psychosocial benefits of corrective surgery for adults with strabismus. Br J Ophthalmol 2006;90:883–8.
Bigyabati R, Victor R, Rajkumari B. A study of prevalence of ocular morbidities in school going children in a rural District of Manipur. J Evol Med Dent Sci 2016;5:3540–3.
Krimsky E. The Management of Ocular Imbalance. Philadelphia, Lea and Febiger; 1948. p. 23.
Hirschberg J. Beiträge zur Lehre vom Schielen und von der Schieloperation. Zentralblatt für Praktische Augenheilkunde. Leipzig: Verlag von Veit and Co.; 1886. p. 5–9.
Cibis GW, Waeltermann JM. Rapid strabismus screening for the pediatrician. Clin Pediatr (Phila) 1986;25:304–7.
von Noorden GK. Binocular Vision and Ocular Motility: Theory and Management of Strabismus. St. Louis, CV Mosby; 1985.
Quicker MW, Boothe RG. A photographic technique for measuring horizontal and vertical eye alignment throughout the field of gaze. Invest Ophthalmol Vis Sci 1992;33:234–46.
Brodie SE. Photographic calibration of the Hirschberg test. Invest Ophthalmol Vis Sci 1987;28:736–42.
Dericioğlu V, Çerman E. Quantitative measurement of horizontal strabismus with digital photography. J AAPOS 2019;23:18e1–6.
See Vision, L. L. C. (2021). 9Gaze App. Available from: https://www.seevisionllc.com/9gaze. [Last accessed on 2021 Feb 18].
João Meneses. Snellen Chart (version 3.1.1) [Mobile application software]. Google Play Store. 2016.
Dupont WD, Plummer WD. Power and sample size calculations for studies involving linear regression. Controll Clin Trials 1998;19:589–601.
Schoonjans F. MedCalc statistical software-free trial available. MedCalc; 2023. Available from: https://www.medcalc.org/. [Last accessed on 2022 Dec 12].
Ozdemir O, Tunay ZÖ, Petriçli IS, Acar DE, Acar U, Erol MK. Analysis of the horizontal corneal diameter, central corneal thickness, and axial length in premature infants. Arq Bras Oftalmol 2014;77:225–7.
Bicas HEA. A new unity for angular measurements in strabismus. Arq Bras Oftalmol 2014;77:275–9.
JASP Team (2024). JASP (Version 0.18.3) [Computer software]. Available from: https://jasp-stats.org. [Last accessed on 2022 Nov 08].
JNNP 2018 April 89 4 346 online supplementary material 1 PDF (no date) Scribd. Available from: https://www.scribd.com/document/449485215/jnnp-2018-April-89-4-346-inline-supplementary-material-1-pdf/. [Last accessed on 2023 June 28].
Yang HK, Han SB, Hwang JM, Kim YJ, Jeong CB, Kim KG. Assessment of binocular alignment using the three-dimensional Strabismus Photo Analyzer. Br J Ophthalmol 2012;96:78–82.
Tengtrisorn S, Tungsattayathitthan A, Na Phatthalung S, Singha P, Rattanalert N, Bhurachokviwat S, et al. The reliability of the angle of deviation measurement from the Photo-Hirschberg tests and Krimsky tests. PLoS One 2021;16:e0258744.
Tengtrisorn S, Tangkijwongpaisarn S, Burachokvivat S. The calibration of the corneal light reflex to estimate the degree of an angle of deviation. J Med Assoc Thai 2015;98:1193–8.
Duangsang S, Tengtrisorn S. The central corneal light reflex ratio from photographs derived from a digital camera in young adults. J Med Assoc Thai 2012;95:699–703.
Choi RY, Kushner BJ. The accuracy of experienced strabismologists using the Hirschberg and Krimsky tests. Ophthalmology 1998;105:1301–6.