Effect of Cataract Grade according to Wide-Field Fundus Images on Measurement of Macular Thickness in Cataract PatientsEffect of Cataract Grade according to Wide-Field Fundus Images on Measurement of Macular Thickness in Cataract Patients
- Other Titles
- Effect of Cataract Grade according to Wide-Field Fundus Images on Measurement of Macular Thickness in Cataract Patients
- Authors
- 김민구; 엄영섭; 송종석; 김효명
- Issue Date
- 2018
- Publisher
- 대한안과학회
- Keywords
- Cataract; Fundus oculi; Optical coherence tomography; Signal-to-noise ratio; Wide-filed fundus images
- Citation
- Korean Journal of Ophthalmology, v.32, no.3, pp.172 - 181
- Indexed
- KCI
- Journal Title
- Korean Journal of Ophthalmology
- Volume
- 32
- Number
- 3
- Start Page
- 172
- End Page
- 181
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/79224
- DOI
- 10.3341/kjo.2017.0067
- ISSN
- 1011-8942
- Abstract
- Purpose: To investigate the effects of cataract grade based on wide-field fundus imaging on macular thickness measured by spectral domain optical coherence tomography (SD-OCT) and its signal-to-noise ratio (SNR). Methods: Two hundred cataract patients (200 eyes) with preoperative measurements by wide-field fundus imaging and macular SD-OCT were enrolled. Cataract severity was graded from 1 to 4 according to the degree of macular obscuring by cataract artifact in fundus photo images. Cataract grade based on wide-field fundus image, the Lens Opacity Classification System III, macular thickness, and SD-OCT SNR were compared. All SD-OCT B-scan images were evaluated to detect errors in retinal layer segmentation. Results: Cataract grade based on wide-field fundus imaging was positively correlated with grade of posterior subcapsular cataracts (rho = 0.486, p < 0.001), but not with nuclear opalescence or cortical cataract using the Lens Opacity Classification System III. Cataract grade was negatively correlated with total macular thickness (rho = -0.509, p < 0.001) and SD-OCT SNR (rho = -0.568, p < 0.001). SD-OCT SNR was positively correlated with total macular thickness (rho = 0.571, p < 0.001). Of 200 eyes, 97 (48.5%) had segmentation errors on SD-OCT. As cataract grade increased and SD-OCT SNR decreased, the percentage of eyes with segmentation errors on SD-OCT increased. All measurements of macular thickness in eyes without segmentation errors were significantly greater than those of eyes with segmentation errors. Conclusions: Posterior subcapsular cataracts had profound effects on cataract grade based on wide-field fundus imaging. As cataract grade based on wide-field fundus image increased, macular thickness tended to be underestimated due to segmentation errors in SD-OCT images. Segmentation errors in SD-OCT should be considered when evaluating macular thickness in eyes with cataracts.
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