Measuring Choroidal Thickness Using Optical Coherence Tomography
For patients and families
In plain language
An automatic summary of structured registry data. It is an orientation aid, not a substitute for the official protocol or a physician assessment.
- What is being studied
- The protocol lists: optical coherence tomography.
- Who it may be relevant to
- Registry conditions: Choroid Disease, Diabetes Mellitus. Basic parameters: 30 years — 95 years · All.
- What needs checking
- Age, condition and sex are only basic indicators. Prior treatment, laboratory values and other mandatory requirements appear in the eligibility criteria below.
- Where it takes place
- Center list to be confirmed — check the primary protocol.
- Next step
- Save the trial, show it to the treating physician, and confirm current recruitment with the study center. Costs, documents and travel →
Unsure about the terms? Read our patient guide →
Official title
Comparing the Choroidal Thickness Using Optical Coherence Tomography Between the Eyes of Healthy Individuals and Diabetic Patients Without Retinopathy
Overview
To compare the choroidal thickness in eyes of diabetic patients with eyes of age matched controls using optical coherence tomography.
Detailed description
Diabetic retinopathy (DR) is the most common and specific complication of DM. It is one of the leading causes of preventable blindness in the adult working population. (1) DR was the fifth leading cause of blindness and of moderate and severe vision impairment.
Global prevalence of diabetic retinopathy was 22.27% and prevalence was highest in Africa (35.90%). (1)
Fortunately, much of the visual loss from DR is preventable, and the rates of vision loss from diabetes and DR have declined over the past few decades due to advances in ocular disease assessment, screening, imaging and treatment in recent years. (2)
The outer third of the retina gets oxygen and nutrients from choroid. The three vascular layers of choroid are chorio capillaries layer, Sattler layer and Haller layer. (3)
A healthy choroid is essential for retinal function by continuous perfusion into the outer retina, which plays critical roles in thermoregulation of the retina, maintenance of the anatomic position of the retina, removal of residues, and secretion of growth factors. (4-5)
The vascular choroid changes of the diabetic patients are quite similar to those seen in DR, such as increased vascular tortuosity, vascular outpouchings, microaneurysms, nonperfusion areas, vascular dilations and narrowing, and choroidal neovascularization. (6)
Until recently, the choroid could only be evaluated by indocyanine green angiography, laser Doppler flowmetry, and ultrasonography. (6) Optical coherence tomography (OCT) is a non-invasive imaging modality, which is used in acquiring high-resolution sections of retina. (5)
Interventions
- Device optical coherence tomography
measuring choroidal thickness using optical coherence tomography
Primary outcome measures
- comparison between choroidal thickness [Time frame: 2 years]
Eligibility criteria
Inclusion criteria
- All known Type 2 DM patients aged 30 to 95 years either gender who presented to ophthalmology clinics in Assuit ophthalmology hospital with no history of ocular treatment (ocular treatment naïve) and visual acuity of 0.1 (6/60) or more that are able to complete an eye examination, and non-diabetic healthy individuals (HbA1c <7) will be included in the study.
Exclusion criteria
- Known diagnosis of any other retinal disease, glaucoma, neurodegenerative disease, and any significant media opacities that precluded fundus imaging and not giving consent will be excluded.
Criteria are shown verbatim from the registry (in English). Final eligibility is always assessed by the study center.
Healthy volunteers: Yes
Study design
- Observational model
- Cohort
Study locations
Center list to be confirmed — check the primary protocol.
Publications
- Teo ZL, Tham YC, Yu M, Chee ML, Rim TH, Cheung N, Bikbov MM, Wang YX, Tang Y, Lu Y, Wong IY, Ting DSW, Tan GSW, Jonas JB, Sabanayagam C, Wong TY, Cheng CY. Global Prevalence of Diabetic Retinopathy and Projection of Burden through 2045: Systematic Review and Meta-analysis. Ophthalmology. 2021 Nov;128(11):1580-1591. doi: 10.1016/j.ophtha.2021.04.027. Epub 2021 May 1. PMID 33940045
- Tan TE, Wong TY. Diabetic retinopathy: Looking forward to 2030. Front Endocrinol (Lausanne). 2023 Jan 9;13:1077669. doi: 10.3389/fendo.2022.1077669. eCollection 2022. PMID 36699020
- Hassan H, Cheema A, Tahir MA, Nawaz HN. Comparison of choroidal thickness in eyes of diabetic patients with eyes of healthy individuals using optical coherence tomography in a tertiary care hospital. Pak J Med Sci. 2022 Jan-Feb;38(1):254-260. doi: 10.12669/pjms.38.1.4443. PMID 35035435
- Endo H, Kase S, Saito M, Yokoi M, Takahashi M, Ishida S, Kase M. Choroidal Thickness in Diabetic Patients Without Diabetic Retinopathy: A Meta-analysis. Am J Ophthalmol. 2020 Oct;218:68-77. doi: 10.1016/j.ajo.2020.05.036. Epub 2020 Jun 20. PMID 32574782
- Regatieri CV, Branchini L, Carmody J, Fujimoto JG, Duker JS. Choroidal thickness in patients with diabetic retinopathy analyzed by spectral-domain optical coherence tomography. Retina. 2012 Mar;32(3):563-8. doi: 10.1097/IAE.0b013e31822f5678. PMID 22374157
- Tavares Ferreira J, Vicente A, Proenca R, Santos BO, Cunha JP, Alves M, Papoila AL, Abegao Pinto L. CHOROIDAL THICKNESS IN DIABETIC PATIENTS WITHOUT DIABETIC RETINOPATHY. Retina. 2018 Apr;38(4):795-804. doi: 10.1097/IAE.0000000000001582. PMID 28267113
Identifiers
NCT: NCT06272851 · Choroidal thickness by OCT