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.
IgA Deficiency Diagnosis. 1  The diagnosis is made by detecting low levels of IgA in the blood and the saliva. 2  Radioimmunoassay, ELISA, or automated laser nephelometry are performed to measure serum immunoglobulin concentrations.gA Deficiency Diagnosis. 1  The diagnosis is made by detecting low levels of IgA in the blood and the saliva. 2  Radioimmunoassay, ELISA, or automated laser nephelometry are performed to measure serum immunoglobulin concentrations.