Contrast Sensitivity Function for Stereopsis

Perception ◽  
1978 ◽  
Vol 7 (4) ◽  
pp. 423-429 ◽  
Author(s):  
John P Frisby ◽  
John E W Mayhew
Keyword(s):  
Spatial Frequency ◽  
Contrast Sensitivity ◽  
Narrow Band ◽  
Sensitivity Function ◽  
Contrast Sensitivity Function ◽  
Band Noise ◽  
Random Dot Stereograms ◽  
Simple Detection ◽  
Global Stereopsis ◽  
Contrast Thresholds

Contrast thresholds for stereopsis from narrow-band-filtered random-dot stereograms were compared with contrast thresholds for simple detection of similar narrow-band noise. Centre frequencies of filters were in the range 2·5–15 cycles deg−1. It was found that the contrast sensitivity function for stereopsis is similar in shape to that for detection, suggesting that as far as contrast requirements are concerned the mechanisms of global stereopsis do not show a bias in sensitivity to any particular spatial frequency but instead require a constant level of suprathreshold contrast regardless of spatial frequency.

scholarly journals Contrast sensitivity before and after small incision lenticule extraction and femtosecond laser in situ keratomileusis

2019 ◽  
Vol 16 (4) ◽  
pp. 284-292
Author(s):  
Asik Pradhan ◽  
Kishore Raj Pradhan ◽  
Gauri Shankar Shrestha ◽  
Purushottam Dhunganga ◽  
Raju Kaiti
Keyword(s):  
Spatial Frequency ◽  
Contrast Sensitivity ◽  
Refractive Surgery ◽  
Sensitivity Function ◽  
Contrast Sensitivity Function ◽  
Laser In Situ Keratomileusis ◽  
Small Incision Lenticule Extraction ◽  
Spatial Frequencies ◽  
Lenticule Extraction

Introduction: Contrast sensitivity function after laser ablation of the cornea in refractive surgery is an important tool for measuring quality of visual function. The effect of small incision lenticule extraction (SMILE) and femtosecond laser in situ keratomileusis (FS-LASIK) on visual function can be compared by measuring spatial contrast sensitivity. Purpose: This study was to compare contrast sensitivity function in patients undergoing refractive surgery for myopia at Tilganga Institute of Ophthalmology. Methods: In a retrospective study, 15 subjects who underwent refractive surgeries comprising 9 cases of SMILE and 6 cases of FS-LASIK at Tilganga Eye Hospital were enrolled in the study. A major assessment included best corrected monocular contrast sensitivity with functional vision analyzer at spatial frequencies of 1.5, 3, 6, 12, and 18 cycles/deg in photopic condition (85 cd/m2) before, 3 months, and 1 year after the surgery. The average functional acuity contrast test scores for each spatial frequency were recorded. Differences between preoperative and postoperative contrast sensitivity at each spatial frequency were analyzed through parametric paired Student’s t-test. Results: Contrast sensitivity of postoperative FS-LASIK and SMILE did not differ from preoperative values at a photopic level. However, at high spatial frequency (12 and 18 cycles/deg), contrast sensitivity function improved significantly (p < 0.05) in eyes after FS-LASIK. Eyes after SMILE surgery did not show any reduction in contrast sensitivity at all the spatial frequencies. Conclusion: Under photopic conditions, the contrast sensitivity function is unaffected by SMILE or FS-LASIK.

scholarly journals Enhancing the contrast sensitivity function through action video game training

2009 ◽  
Vol 12 (5) ◽  
pp. 549-551 ◽  
Author(s):  
Renjie Li ◽  
Uri Polat ◽  
Walter Makous ◽  
Daphne Bavelier
Keyword(s):  
Contrast Sensitivity ◽  
Video Game ◽  
Sensitivity Function ◽  
Contrast Sensitivity Function ◽  
Action Video Game
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