Effects of age and optical blur on real depth stereoacuity

• Published in: Ophthalmic & physiological optics Vol. 30; no. 5; pp. 660 - 666
• Main Authors: Costa, Marcelo F., Moreira, Sonia M. C. F., Hamer, Russell D., Ventura, Dora F.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Oxford, UK Blackwell Publishing Ltd 01-09-2010; Blackwell
• Subjects: Adolescent; Adult; Aging - physiology; Aging - psychology; binocular vision; Biological and medical sciences; Depth Perception - physiology; Eye and associated structures. Visual pathways and centers. Vision; Female; Fundamental and applied biological sciences. Psychology; Humans; Male; Medical sciences; Middle Aged; Ophthalmology; optical blur; Photic Stimulation - methods; real depth; Sensory Thresholds - physiology; stereoacuity; stereopsis; Vertebrates: nervous system and sense organs; Vision Disparity - physiology; Vision, Binocular - physiology; Visual Acuity - physiology; Young Adult; real depth; optical blur; stereoacuity; Binocular vision; Ophthalmology; Stereopsis; Age; Depth
• ISSN: 0275-5408; 1475-1313
• DOI: 10.1111/j.1475-1313.2010.00750.x

Stereoscopic depth perception utilizes the disparity cues between the images that fall on the retinae of the two eyes. The purpose of this study was to determine what role aging and optical blur play in stereoscopic disparity sensitivity for real depth stimuli. Forty‐six volunteers were tested ranging in age from 15 to 60 years. Crossed and uncrossed disparity thresholds were measured using white light under conditions of best optical correction. The uncrossed disparity thresholds were also measured with optical blur (from +1.0D to +5.0D added to the best correction). Stereothresholds were measured using the Frisby Stereo Test, which utilizes a four‐alternative forced‐choice staircase procedure. The threshold disparities measured for young adults were frequently lower than 10 arcsec, a value considerably lower than the clinical estimates commonly obtained using Random Dot Stereograms (20 arcsec) or Titmus Fly Test (40 arcsec) tests. Contrary to previous reports, disparity thresholds increased between the ages of 31 and 45 years. This finding should be taken into account in clinical evaluation of visual function of older patients. Optical blur degrades visual acuity and stereoacuity similarly under white‐light conditions, indicating that both functions are affected proportionally by optical defocus.