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.
Selective IgA deficiency may also be found with autoimmune disease, in which your immune system attacks particular organs or tissues in your own body. Common autoimmune conditions found with IgA deficiency include rheumatoid arthritis, lupus and celiac disease.