The significance of changes in pupil size during straylight measurement and with varying environmental illuminance
Purpose: In this work, we investigated the pupillary conditions during straylight measurement, and the potential effect this might have on the measured straylight. Methods: Five young (26–29-years-old) and 15 older (50–68-years-old) individuals participated in this study. First, the pupil diameter o...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2018-07-01
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| Series: | Journal of Optometry |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S1888429617300729 |
| _version_ | 1818948097117519872 |
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| author | Sonia Gholami Nicolaas J. Reus Thomas J.T.P. van den Berg |
| author_facet | Sonia Gholami Nicolaas J. Reus Thomas J.T.P. van den Berg |
| author_sort | Sonia Gholami |
| collection | DOAJ |
| description | Purpose: In this work, we investigated the pupillary conditions during straylight measurement, and the potential effect this might have on the measured straylight. Methods: Five young (26–29-years-old) and 15 older (50–68-years-old) individuals participated in this study. First, the pupil diameter of both eyes was measured at three room illuminances. Next, straylight was assessed at two room illuminances. Simultaneously, the change in pupil size of the fellow eye was registered by a camera. Results: Pupil size decreased with room illuminance and with age (both p < 0.05). The dependency of pupil size on age decreased as room illuminance increased (0.018 mm/year at 4 lux, 0.014 mm/year at 40 lux, and 0.008 mm/year at 400 lux illuminances). However, during straylight measurement, pupil sizes hardly differed between 4 and 40 lux illuminances. Respective pupil sizes corresponded with 399 and 451 lux adaptation on average. No statistically significant difference was found between the straylight under the two illuminances with average R2 = 0.85, p < 0.05. Conclusion: We conclude that the illuminance of the examination room during straylight assessment does not affect the outcome in normal eyes. In fact, under mesopic and scotopic conditions, the luminance of the test field is so much higher than that of the room so that it determines the pupil size. Regardless of the lighting level, straylight measured in a laboratory, is valid for photopic pupils at an adaptation level corresponding with about 400 lux room illuminance. Resumen: Objetivo: En este trabajo investigamos las condiciones de la pupila durante la medición de la dispersión lumínica, así como el efecto potencial que ello podría tener sobre la dispersión lumínica medida. Métodos: En el estudio participaron cinco individuos jóvenes (de 26 a 29 años) y 15 mayores (de 50 a 68 años). En primer lugar, se midió el diámetro de la pupila de ambos ojos con tres iluminancias ambientales. A continuación, se evaluó la dispersión lumínica con dos iluminancias ambientales. De manera simultánea, se registró mediante una cámara el cambio del tamaño de la pupila del otro ojo. Resultados: El tamaño de la pupila se redujo con la iluminancia ambiental y la edad (p < 0,05 para ambos). La dependencia del tamaño de la pupila con la edad se redujo a medida que aumentaba la iluminancia ambiental (0,018 mm/año a iluminancias de 4 lux, 0,014 mm/año a 40 lux, y 0,008 mm/año a 400 lux). Sin embargo, durante la medición de la dispersión lumínica, los tamaños de la pupila difirieron escasamente entre iluminancias de 4 y 40 lux. Los tamaños de la pupila respectivos se correspondieron con una adaptación de 399 y 451 lux, de media. No se encontraron diferencias estadísticamente significativas entre la dispersión lumínica bajo las dos iluminancias y la media de R2 = 0,85, p < 0,05. Conclusión: Concluimos que la iluminancia de la sala de examen durante la valoración de la dispersión lumínica no afecta al resultado en ojos normales. De hecho, en condiciones mesópicas y fotópicas, la iluminancia del campo de prueba es muy superior a la de la sala, lo cual determina el tamaño de la pupila. Independientemente del nivel de iluminación, la dispersión lumínica medida en un laboratorio es válida para pupilas fotópicas a un nivel de adaptación correspondiente a una iluminancia ambiental de alrededor de 400 lux. Keywords: Eye, Pupil size, Ocular straylight, C-Quant straylight-meter, Room illuminance, Palabras clave: Ojo, Tamaño de la pupila, Dispersión lumínica ocular, C-Quant straylight-meter, Iluminancia ambiental |
| first_indexed | 2024-12-20T08:41:23Z |
| format | Article |
| id | doaj.art-5b985e1d0a1f4139af714f262cc86e19 |
| institution | Directory Open Access Journal |
| issn | 1888-4296 |
| language | English |
| last_indexed | 2024-12-20T08:41:23Z |
| publishDate | 2018-07-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Optometry |
| spelling | doaj.art-5b985e1d0a1f4139af714f262cc86e192022-12-21T19:46:23ZengElsevierJournal of Optometry1888-42962018-07-01113167173The significance of changes in pupil size during straylight measurement and with varying environmental illuminanceSonia Gholami0Nicolaas J. Reus1Thomas J.T.P. van den Berg2Rotterdam Ophthalmic Institute, Schiedamse Vest 160, 3011 BH Rotterdam, The Netherlands; Corresponding author.Amphia Hospital, Department of Ophthalmology, Langendijk 75, 4819 EV Breda, The NetherlandsNetherlands Institute for Neuroscience, Royal Netherlands Academy of Arts and Sciences, Meibergdreef 47, 1105 BA Amsterdam, The NetherlandsPurpose: In this work, we investigated the pupillary conditions during straylight measurement, and the potential effect this might have on the measured straylight. Methods: Five young (26–29-years-old) and 15 older (50–68-years-old) individuals participated in this study. First, the pupil diameter of both eyes was measured at three room illuminances. Next, straylight was assessed at two room illuminances. Simultaneously, the change in pupil size of the fellow eye was registered by a camera. Results: Pupil size decreased with room illuminance and with age (both p < 0.05). The dependency of pupil size on age decreased as room illuminance increased (0.018 mm/year at 4 lux, 0.014 mm/year at 40 lux, and 0.008 mm/year at 400 lux illuminances). However, during straylight measurement, pupil sizes hardly differed between 4 and 40 lux illuminances. Respective pupil sizes corresponded with 399 and 451 lux adaptation on average. No statistically significant difference was found between the straylight under the two illuminances with average R2 = 0.85, p < 0.05. Conclusion: We conclude that the illuminance of the examination room during straylight assessment does not affect the outcome in normal eyes. In fact, under mesopic and scotopic conditions, the luminance of the test field is so much higher than that of the room so that it determines the pupil size. Regardless of the lighting level, straylight measured in a laboratory, is valid for photopic pupils at an adaptation level corresponding with about 400 lux room illuminance. Resumen: Objetivo: En este trabajo investigamos las condiciones de la pupila durante la medición de la dispersión lumínica, así como el efecto potencial que ello podría tener sobre la dispersión lumínica medida. Métodos: En el estudio participaron cinco individuos jóvenes (de 26 a 29 años) y 15 mayores (de 50 a 68 años). En primer lugar, se midió el diámetro de la pupila de ambos ojos con tres iluminancias ambientales. A continuación, se evaluó la dispersión lumínica con dos iluminancias ambientales. De manera simultánea, se registró mediante una cámara el cambio del tamaño de la pupila del otro ojo. Resultados: El tamaño de la pupila se redujo con la iluminancia ambiental y la edad (p < 0,05 para ambos). La dependencia del tamaño de la pupila con la edad se redujo a medida que aumentaba la iluminancia ambiental (0,018 mm/año a iluminancias de 4 lux, 0,014 mm/año a 40 lux, y 0,008 mm/año a 400 lux). Sin embargo, durante la medición de la dispersión lumínica, los tamaños de la pupila difirieron escasamente entre iluminancias de 4 y 40 lux. Los tamaños de la pupila respectivos se correspondieron con una adaptación de 399 y 451 lux, de media. No se encontraron diferencias estadísticamente significativas entre la dispersión lumínica bajo las dos iluminancias y la media de R2 = 0,85, p < 0,05. Conclusión: Concluimos que la iluminancia de la sala de examen durante la valoración de la dispersión lumínica no afecta al resultado en ojos normales. De hecho, en condiciones mesópicas y fotópicas, la iluminancia del campo de prueba es muy superior a la de la sala, lo cual determina el tamaño de la pupila. Independientemente del nivel de iluminación, la dispersión lumínica medida en un laboratorio es válida para pupilas fotópicas a un nivel de adaptación correspondiente a una iluminancia ambiental de alrededor de 400 lux. Keywords: Eye, Pupil size, Ocular straylight, C-Quant straylight-meter, Room illuminance, Palabras clave: Ojo, Tamaño de la pupila, Dispersión lumínica ocular, C-Quant straylight-meter, Iluminancia ambientalhttp://www.sciencedirect.com/science/article/pii/S1888429617300729 |
| spellingShingle | Sonia Gholami Nicolaas J. Reus Thomas J.T.P. van den Berg The significance of changes in pupil size during straylight measurement and with varying environmental illuminance Journal of Optometry |
| title | The significance of changes in pupil size during straylight measurement and with varying environmental illuminance |
| title_full | The significance of changes in pupil size during straylight measurement and with varying environmental illuminance |
| title_fullStr | The significance of changes in pupil size during straylight measurement and with varying environmental illuminance |
| title_full_unstemmed | The significance of changes in pupil size during straylight measurement and with varying environmental illuminance |
| title_short | The significance of changes in pupil size during straylight measurement and with varying environmental illuminance |
| title_sort | significance of changes in pupil size during straylight measurement and with varying environmental illuminance |
| url | http://www.sciencedirect.com/science/article/pii/S1888429617300729 |
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