PURPOSE Normal color vision depends on normal long wavelength (L), middle wavelength (M), and short wavelength sensitive (S) cones. Hereditary "red-green" color vision deficiency (CVD) is due to a shift in peak sensitivity or lack of L or M cones. Hereditary S cone CVD is rare but can be acquired as an early sign of disease. Current tests detect CVD but few diagnose type or severity, critical f...

Purpose: Ocular hypertensives (OHT) are patients with high intraocular pressure (IOP), normal optic discs and visual fields. IOP is the major risk factor for glaucomatous disc damage. These OHT patients are considered ‘glaucoma suspects’ because there is a remote possibility of evolution toward disease. This means that clinical supervision is needed to discover glaucomatous disc damage as soon ...

We used Southern blot hybridization to study X chromosome-linked color vision genes encoding the apoproteins of red and green visual pigments in 134 unselected Caucasian men. One hundred and thirteen individuals (84.3%) had a normal arrangement of their color vision pigment genes. All had one red pigment gene; the number of green pigment genes ranged from one to five with a mode of two. The fre...

It is estimated that inherited red-green color deficiency, which involves both the protan and deutan deficiency types, is common in men. For red-green defective observers, some reddish colors appear desaturated and brownish, unlike those seen by normal observers. Despite its prevalence, few studies have investigated the effects that red-green color deficiency has on the psychological properties...

Color vision deficiency (CVD) occurs when there is an error in the development of one or more types of retinal cone cells that receive color in light and transmit that information to the optic nerve (1). Among them, red-green CVD shows the highest prevalence (2). Red-Green CVD is divisible into severe or dichromatic forms [protanopia and deu-teranopia] and milder or anomalous trichromatic forms...

Nicotine, a psychoactive compound of cigarette, is an alkaloid that binds and activates nicotinic acetylcholine receptors on the retina and lateral geniculate nucleus, being able to affect visual spatial processing. Losses in color vision have been associated with chronic exposure to cigarette. Since not all tests of color discrimination investigation are designed to detect acquired losses, the...