بایگانی برچسب برای: The Eye

Eye.in.Pediatric.Systemic.Disease.[taliem.ir]

The Eye in Pediatric Systemic Disease

Perhaps the most frequent question which parents ask pertaining to their infant’s eyes is “What does my baby see?” The answer to this question depends in part on the type of method used to assess visual acuity. The majority of babies should show some fxational behavior at term birth. At 4 weeks, the baby looks at their mother’s face while breast feeding . When the mother moves her face, the child will follow it visually. This movement is interrupted if the mother turns her face away so that only her profle is presented . By 2 months the baby is following better but the pursuit movements tend to be jerky rather than smooth . Smooth pursuit eye movements show the most maturation from 2 to 6 months old, and reaching almost an adult-like gain by 18 months old . Pieh and coworkers found that tracking time was highest when a larger stimulus of 4.78° of visual angle was applied (p<0.022) and when the stimulus was moved at a medium stimulus velocity of 15 degree/s (p<0.0002) . Often, the human face is a better stimulus of fxation than a light source . Goren et al. were able to show that 9 min old infants had a preference for a face-like stimulus over a scrambled face image. Both of these were preferred by the infant over a blank face image.