The difference in available light from the larger exit pupil is significant. The larger the exit pupil, the less critical the position of your head in relation to the scope is, also. The distance that your eye must be to the ocular lens to get a full, clear picture is called eye relief.
Symptoms of Selective IgA Deficiency. People with selective IgA deficiency are at risk of infections. About half of the patients with selective IgA deficiency who come to medical attention have repeated infections of the ears, sinuses, and bronchi (airways of the lungs), and pneumonia.
Signs and symptoms. Infections that commonly affect people with IgG deficiency include: Sinus infections and other respiratory infections. Ear infections. Pneumonia.Bronchitis. Infections that result in sore throat. blood test that measures immunoglobulin can show abnormally low levels of the antibodies and diagnose IgG deficiency. It's possible to have a normal level of total IgG, so the testing of the IgG subclasses is important.