Information on Various Common Ailments

Acne
Alcoholism
Amnesia
Anaemia
Anorexia
Appendicitis
Areriosclerosis
Arthritis
Asthma
Backache
Boils
Bronchitis
Cataract
Cholera
Cirrhosis
Colitis
Conjuctivitis
Corns
Coronary Heart Disease
Cough
Cystitis
Dandruff
Defective Vision
Depression
Diabetes Mellitus
Dysmenorrhoea
Diarrhoea
Female Sterility
Fever
Gall Bladder Disorders
Gastritis
Goitre
Gout
Hair Loss
Halitosis
Headaches
High Blood Cholesterol
High Blood Pressure
Hives
Hypoglycemia
Hypertension
Influenza
Insomania
Jaundice
Kidney Stones
Leucorrhoea
Low Blood Pressure
Malaria
Measles
Menopausal Disorders
Migraine
Mumps
Nausea
Nephritis
Obesity
Palpitation
Peptic Ulcer
Piles
Pneumonia
Psoriasis
Ringworm
Scurvy
Sinusitis
Smallpox
Snoring
Sore Throat
Stress
Tonsillitis
Toothache
Tuberculosis
Urinary Tract Infection
Urticaria
Varicose Veins
Vision Impairment
Warts
Whooping Cough

Defective Vision - Introduction

Definition:

Defective vision refers to the inability to see objects clearly. This can be night blindness, inability to see far off objects (short sightedness) or inability to see close objects (long sightedness).

One of the main category of defective vision is color blindness. It is a visual defect resulting in the inability to distinguish colors. Color blindness is usually an inherited sex-linked characteristic. Most of those suffering with defective color vision are only partially color-blind to red and green, i.e., they have a limited ability to distinguish reddish and greenish shades.

Defective vision is nothing but a condition in which the visual images come to focus in front of the retina of the eye because of defects in the refractive media of the eye or of abnormal length of the eyeball resulting especially in defective vision of distant objects.