Cone signals for spectacle-lens compensation: Differential responses to short and long wavelengths
Open accessAbstract
Chick eyes compensate for defocus imposed by spectacle lenses by making compensatory changes in eye length and choroidal thickness, a laboratory model of emmetropization. To investigate the roles of longitudinal chromatic aberration and of chromatic mechanisms in emmetropization, we examined the participation of different cone classes, and we compared the efficacy of lens compensation under monochromatic illumination with that under white light of the same illuminance to the chick eye. Chicks wore positive or negative 6D or 8D lenses on one eye for 3 days, under either blue (460 nm) or red (620 nm) light at 0.67 lux or under white light at 0.67 or 0.2 lux (all measures are corrected for chick photopic sensitivity). The illumination conditions were chosen to differentially stimulate either the short-wavelength and ultraviolet cones or the long-wavelength and double cones. Measurements are expressed as the relative change: the inter-ocular difference in the amount of change over the 3 days of lens wear. We find that under this low illumination the two components of lens compensation were differentially affected by the monochromatic illumination: in blue light lens compensation was mainly due to changes in eye length, whereas in red light lens compensation was mainly due to changes in choroidal thickness. In general, white light produced better lens compensation than monochromatic illumination. NEGATIVE LENSES: Under white light negative lenses caused an increase in eye length (60 microm) together with a decrease in choroidal thickness (-51 microm) relative to the fellow eye. Under blue light, although there was an increase in eye length (32 microm), there was no change in choroidal thickness (5 microm). In contrast, under red light there was a decrease in choroidal thickness (-62 microm) but no increase in eye length (8 microm). Relative ocular elongation was the same in white and monochromatic light. POSITIVE LENSES: Under white light positive lenses caused a decrease in eye length (-142 microm) together with an increase in choroidal thickness (68 microm) relative to the fellow eye. Under blue light, there was a decrease in eye length (-64 microm), but no change in choroidal thickness (2 microm). In contrast, under red light there was an increase (90 microm) in choroidal thickness but less of a decrease (-36 microm) in eye length. Lens compensation by inhibition of ocular elongation was less effective under monochromatic illumination than under white light (white v red: p=0.003; white v blue p=.014). The differential effects of red and blue light on the choroidal and ocular length compensatory responses suggest that they are driven by different proportions of the cone-types, implying that, although chromatic contrast is not essential for lens compensation and presumably for emmetropization as well, the retinal substrates exist for utilizing chromatic contrast in these compensatory responses. The generally better lens compensation in white than monochromatic illumination suggests that longitudinal chromatic aberration may be used in lens compensation.
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In chicks, with hyperopic defocus, the cone contrast comparison will be between S-cones and double cones, since the spectral sensitivity of L- and M-cones is attenuated at short wavelengths.
“In chicks, with hyperopic defocus, the cone contrast comparison will be between the Scones and the double cones, since the spectral sensitivity of the L-and M-cones is attenuated at short wavelengths (Rucker & Wallman, 2008).”
From Chicks use changes in luminance and chromatic contrast as indicators of the sign of defocus (2012) · cites this paper as Rucker & Wallman, 2008
The Introduction describes double cones as sensitive into the short-wavelength region, and Methods (‘Chick cone sensitivity functions’; page unavailable) describes short-wavelength filtering in M- and L-cones, with a sharper cutoff in L-cones than in double cones. But the paper does not establish that hyperopic defocus is assessed by comparing S-cone and double-cone contrast; the Discussion says it did not directly test whether longitudinal chromatic aberration is used in lens compensation. (LLM, conf=0.82)
Experimental — accuracy not yet measuredBoth L- and S-cones are used in lens compensation in chicks.
“Therefore, it is important to note that both L-and S-cones are used in lens compensation in chicks (Rucker & Wallman, 2008).”
From Chicks use changes in luminance and chromatic contrast as indicators of the sign of defocus (2012) · cites this paper as Rucker & Wallman, 2008
The Results report lens compensation in both red and blue light, supporting a role for long- and short-wavelength cone pathways in chicks. But the Methods say the experiment could not distinguish L-cones from double cones or S-cones from UV-cones, so it does not establish that both named cone types individually are used. The indexed copy provides no page numbers for these passages. (LLM, conf=0.86)
Experimental — accuracy not yet measuredThe −15.16 D/mm change in eye length is slightly less than the −18 to −25 D/mm change in vitreous chamber depth found in earlier experiments.
“This is slightly less than the À18 D to À25 D/mm change in vitreous chamber depth found in earlier experiments (Kee, Marzani, & Wallman, 2001;Rucker & Wallman, 2008), probably because the choroidal changes reduced the refractive changes (the correlation between the vitreous chamber depth and refraction was only r 2 ¼ 0.04).”
From Chicks use changes in luminance and chromatic contrast as indicators of the sign of defocus (2012) · cites this paper as Rucker & Wallman, 2008
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IMI – Report on Experimental Models of Emmetropization and Myopia
Troilo, D., Smith, E. L., Nickla, D. L., Ashby, R., Tkatchenko, A. V., Ostrin, L. A., Gawne, T. J., Pardue, M. T., Summers, J. A., Kee, C.-S., et al. (2019) · Investigative Opthalmology & Visual Science · doi:10.1167/iovs.18-25967 · Cited by 487 · see citing works
Chicks use changes in luminance and chromatic contrast as indicators of the sign of defocus
Rucker, F. J., & Wallman, J. (2012) · Journal of Vision · doi:10.1167/12.6.23 · Cited by 66 · see citing works
Self-citation
- Authors
- Rucker, F. J., & Wallman, J.
- Affiliations
- City College of New York (US)
- Corresponding author
- Rucker, Frances J.
- ORCID
- Rucker, Frances J.
- Venue
- Vision Research
- Publisher
- Elsevier BV
- Published
- 2008-09
- Volume
- 48
- Issue
- 19
- Pages
- 1980-1991
- ISSN
- 0042-6989 (ISSN-L)
- PMC
- PMC2790044
- OpenAlex
- W2045476736
- Cited by
- 99
- References
- 0
- Citations by year
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- FWCI
- 2.23
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Licence
- Locations
- Vision Research (publishedVersion)
- PubMed (publishedVersion)
- Europe PMC (PubMed Central) (acceptedVersion)
- PubMed Central (acceptedVersion)
- Funders
- National Eye Institute (R01EY002727, EY-02727, R37EY002727)
- National Center for Research Resources (RR-03060)
- Topics
- Health Sciences › Medicine › Epidemiology › Ophthalmology and Visual Impairment Studies
- Life Sciences › Neuroscience › Cognitive Neuroscience › Visual perception and processing mechanisms
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Retinal Development and Disorders
- Keywords
- emmetropization, longitudinal chromatic aberration, cone photoreceptors, short-wavelength cones, double cones, eye length, choroidal thickness, defocus, monochromatic illumination, white light, chick eye, negative lenses, interocular differences
- MeSH terms
- Animals, Chickens, Choroid, Color, Color Perception, Disease Models, Animal, Eye, Eyeglasses, Lens, Crystalline, Photic Stimulation, Refraction, Ocular, Refractive Errors, Retinal Cone Photoreceptor Cells
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