Abstract
The extent to which known variations in photopigment λ(max) and optical density may affect cone ratios estimated from the spectral luminous efficiency function (LEF) was examined. LEFs were generated using L- and M-cone fundamentals, one of which had been shifted in λ(max) (± 1, 2, 4 or 6 nm) or varied in peak optical density (increased or decreased by 10, 25 or 50%). A curve-fitting program was then used to estimate the L/M cone ratios for the generated LEFs assuming standard L- and M-cone fundamentals. These modeling exercises indicate that L/M cone ratios estimated from LEFs are highly correlated with long-wave sensitivity and with known variations in L-cone λ(max). Variations in M-cone λ(max) and photopigment optical density for both cone types are also correlated with L/M cone ratios, but have much less impact on the estimated ratios.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 1961-1966 |
| Number of pages | 6 |
| Journal | Vision Research |
| Volume | 38 |
| Issue number | 13 |
| DOIs | |
| State | Published - Jun 1998 |
| Externally published | Yes |
Keywords
- Heterochromatic flicker photometry
- L/M cone ratio
- Luminous efficiency
ASJC Scopus subject areas
- Ophthalmology
- Sensory Systems
Cite this
Effects of known variations in photopigments on L/M cone ratios estimated from luminous efficiency functions. / Bieber, Michelle L.; Kraft, James M.; Werner, John S.
In: Vision Research, Vol. 38, No. 13, 06.1998, p. 1961-1966.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Effects of known variations in photopigments on L/M cone ratios estimated from luminous efficiency functions
AU - Bieber, Michelle L.
AU - Kraft, James M.
AU - Werner, John S
PY - 1998/6
Y1 - 1998/6
N2 - The extent to which known variations in photopigment λ(max) and optical density may affect cone ratios estimated from the spectral luminous efficiency function (LEF) was examined. LEFs were generated using L- and M-cone fundamentals, one of which had been shifted in λ(max) (± 1, 2, 4 or 6 nm) or varied in peak optical density (increased or decreased by 10, 25 or 50%). A curve-fitting program was then used to estimate the L/M cone ratios for the generated LEFs assuming standard L- and M-cone fundamentals. These modeling exercises indicate that L/M cone ratios estimated from LEFs are highly correlated with long-wave sensitivity and with known variations in L-cone λ(max). Variations in M-cone λ(max) and photopigment optical density for both cone types are also correlated with L/M cone ratios, but have much less impact on the estimated ratios.
AB - The extent to which known variations in photopigment λ(max) and optical density may affect cone ratios estimated from the spectral luminous efficiency function (LEF) was examined. LEFs were generated using L- and M-cone fundamentals, one of which had been shifted in λ(max) (± 1, 2, 4 or 6 nm) or varied in peak optical density (increased or decreased by 10, 25 or 50%). A curve-fitting program was then used to estimate the L/M cone ratios for the generated LEFs assuming standard L- and M-cone fundamentals. These modeling exercises indicate that L/M cone ratios estimated from LEFs are highly correlated with long-wave sensitivity and with known variations in L-cone λ(max). Variations in M-cone λ(max) and photopigment optical density for both cone types are also correlated with L/M cone ratios, but have much less impact on the estimated ratios.
KW - Heterochromatic flicker photometry
KW - L/M cone ratio
KW - Luminous efficiency
UR - http://www.scopus.com/inward/record.url?scp=0031877282&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0031877282&partnerID=8YFLogxK
U2 - 10.1016/S0042-6989(97)00302-7
DO - 10.1016/S0042-6989(97)00302-7
M3 - Article
C2 - 9797942
AN - SCOPUS:0031877282
VL - 38
SP - 1961
EP - 1966
JO - Vision Research
JF - Vision Research
SN - 0042-6989
IS - 13
ER -