Near and Distance Stereoacuity in Patients With Primary Open-angle Glaucoma

Park, Chan Keum; Kim, Dai Woo; Lee, Chang Kyu

doi:10.1097/ijg.0000000000000963

Cited by 7 publications

(6 citation statements)

References 35 publications

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“…However, patients included in this study were specifically selected to have very early-stage glaucoma, no significant asymmetry in clinical measures between their right and left eyes, and the median stereopsis was within the normal population range. It has been previously shown that stereoacuity does deteriorate in early stages of glaucoma and it is more pronounced with severe disease 40,41. Whether patients maintain their binocular summation ability in moderate or late stage disease remains to be explored in future studies.…”

Section: Discussionmentioning

confidence: 97%

“…It has been previously shown that stereoacuity does deteriorate in early stages of glaucoma and it is more pronounced with severe disease. 40,41 Whether patients maintain their binocular summation ability in moderate or late stage disease remains to be explored in future studies. The integrity of the binocular summation function is expected to be affected in patients with prominent functional and structural asymmetries between the 2 eyes, as occurs in more advanced stages of the disease.…”

Section: Discussionmentioning

confidence: 99%

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Binocular Summation of Visual Acuity at High and Low Contrast in Early Glaucoma

Leibovitzh

Trope

Buys

et al. 2022

Journal of Glaucoma

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Précis: This study examined the integrity of binocular summation function in patients with mild glaucoma. We found that binocular summation of visual acuity is preserved in these patients, despite their reduced monocular inputs. Purpose: Binocular summation represents superiority of binocular to monocular performance. In this study we examined the integrity of binocular summation function in patients with early glaucoma who had structural glaucomatous changes but otherwise had no significant interocular acuity asymmetry or other functional deficit detected with standard clinical measures. Materials and Methods: Participants included 48 patients with early glaucoma according to Hodapp, Anderson, and Parrish 2 (HAP2) criteria (age 65±12 y) and 42 healthy controls (age 60±12 y), matched for stereoacuity. Visual acuity was assessed binocularly and monocularly at high (95%) and low (25%) contrast using the Early Treatment Diabetic Retinopathy Study (ETDRS) charts at 6 m. Binocular acuity summation was evaluated utilizing a binocular ratio (BR). Results: Overall, binocular and monocular visual acuity of the control group was better than that of the glaucoma group for both contrast levels, P=0.001. For the glaucoma group, there was a significant difference between BRs at high and low contrast, 0.01±0.05 and 0.04±0.06 (P=0.003), respectively. For the control group, the difference between BR at high and low contrast was not statistically significant, 0.00±0.07 and 0.02±0.06 (P=0.25), respectively. Conclusion: For patients with early glaucoma, binocular summation function for visual acuity was preserved at both contrast levels. This suggests an adaptation of the visual system in early stages of glaucoma that allows for normal binocular summation in the presence of reduced monocular visual input.

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Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 99%

Binocular Summation of Visual Acuity at High and Low Contrast in Early Glaucoma

Leibovitzh

Trope

Buys

et al. 2022

Journal of Glaucoma

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“…Similarly, in another study done to assess the associations between stereoacuity (both near and distance) and the severity of visual field defects (based on HAP and VFI) in POAG, near stereoacuity worsened with POAG severity. However, distance stereoacuity was not associated with POAG severity [ 21 ]. From these, it could be interpreted that impaired depth perception seen in POAG patients is related to the disease process, which could lead to difficulties in activities of daily living.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of depth perception and association of severity in Glaucoma patients and suspects

2021

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Background To evaluate depth perception in Primary open angle glaucoma (POAG), glaucoma suspects compared to controls and to determine the association between depth perception and severity of glaucoma. Methods This was a hospital based, comparative, cross-sectional study. The ethical clearance was taken from institutional review committee of Institute of Medicine [Reference no.399 (6–11) E2 077-078]. Agematched, equal number of participants in each group (N=20) were evaluated with both Titmus and Frisby stereoacuity tests to measure depth perception as stereopsis threshold in seconds of arc. The participants were selected using the purposive sampling technique. Results There was no differences in age, sex, or best corrected visual acuity, intraocular pressure, central corneal thickness (CCT), found among the three groups (POAG, Glaucoma Suspects and Control) respectively. However, there was significant difference in cup disc ratio (CDR) between the groups. Equal number of male and female were there in each group, while in POAG group male to female ratio was 3:2. The mean stereoacuity threshold in control group was 53.5±23.23 seconds of arc with Titmus test and 38.75±18.83 seconds of arc with Frisby stereoacuity test. The difference in threshold was significant between control and glaucoma suspect with Titmus (t=1.991, p=0.05) and with Frisby (t=2.114, p=0.04). The difference was also significant in POAG group by Titmus (t=3.135, p=0.0033) and by Frisby (t=3.014, p=0.004). More so, with increasing severity of glaucoma, the mean threshold of stereopsis increased as seen with both Titmus and Frisby Tests (ANOVA, p < 0.001) Conclusion Primary open angle glaucoma patients and glaucoma suspects, showed significant reduction in depth perception. Decreased stereoacuity was associated with greater glaucomatous visual field loss.

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“…Patients with glaucoma may suffer from the inconvenience of using anti-glaucoma drugs, economic concerns for the cost of anti-glaucoma treatment, and obstacles faced with the visual impairment of glaucoma. Also, glaucoma impacts individuals in several ways, including a reduced ability to perform self-care activities 4 , decreased steroacuity 5 , being prone to tra c accidents, 6 depression, 7 and falls 8 . Thus, the quality of life (QoL) is strongly in uenced by glaucoma.…”

Section: Introductionmentioning

confidence: 99%

Quantitative Visual Tests in Primary Open-Angle Glaucoma Patients According to Three Different Lights With Different Color-Rendering Index

Kim

Go²,

Kang

et al. 2021

Preprint

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Purpose To compare quantitative visual tests, such as visual acuity, contrast sensitivity, and color vision tests in patients with primary open-angle glaucoma (POAG) patients according to three different light systems with different color-rendering index (CRI). Methods This was a cross-sectional study of 20 eyes in 20 patients with POAG. Three different light systems consisting of a 3-band fluorescent lamp (CRI 80), a white LED (CRI 75), and a quantum dot LED (CRI > 95) were used. All lights had the same illuminance of 230 lux to exclude illuminance effects. The visual testing included best-corrected visual acuity (BCVA) using an ETDRS chart, a CSV-1000E contrast test, and a color test performed by the Farnsworth Munsell 100-hue test. Results There was no significant difference in BCVA (p = 0.86). There were no significant differences in the detail contrast tests according to the three light systems (p = 0.98, p = 0.93, p = 0.86, respectively, p = 0.70). There was no significant difference between the three light systems (p = 0.08). However, the color test scores with a quantum dot LED were significantly lower than those of the white LED and 3-band fluorescent lamp (p = 0.03 and 0.047, respectively). Conclusion POAG patients did not show significant differences in visual acuity scores and contrast test scores, expressed as black and white symbols, according to the different light systems. However, POAG patients tested under a quantum dot LED (CRI > 95) could distinguish color differences better than in the other light systems.

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Near and Distance Stereoacuity in Patients With Primary Open-angle Glaucoma

Cited by 7 publications

References 35 publications

Binocular Summation of Visual Acuity at High and Low Contrast in Early Glaucoma

Binocular Summation of Visual Acuity at High and Low Contrast in Early Glaucoma

Evaluation of depth perception and association of severity in Glaucoma patients and suspects

Quantitative Visual Tests in Primary Open-Angle Glaucoma Patients According to Three Different Lights With Different Color-Rendering Index

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