TG and thyroid gland disorder: To this end, we measured ocular biometry and refraction in a large cohort of 4633 participants and compared them to six indicators of thyroid activity (thyroid-stimulating hormone (TSH), free T3 (fT3), free T4 (fT4), thyroglobulin (Tg), thyroglobulin antibodies (TgAb), and thyroid peroxidase antibodies (TPOAb)).