Final answer:
Concomitant squint is synonymous with strabismus, referring to the misalignment of the eyes. Myopia and hyperopia are conditions related to distant and close vision blurriness respectively, requiring glasses for correction. Astigmatism involves corneal or lens irregularities, resulting in uneven focus and potentially requiring cylindrical corrections in glasses.
Step-by-step explanation:
Concomitant Squint and Vision Correction
Among the given options, concomitant squint is synonymous with strabismus. This condition refers to the misalignment of the eyes, where they do not aim at the same point at the same time. It differs from the other conditions listed, such as exotropia (outward turning of an eye), anisometropia (difference in refractive power between the eyes), and amblyopia (reduced vision in an eye that has not received adequate use during early development). Myopia, also known as nearsightedness, is the condition where distant objects appear blurry because the eye converges rays from a distant object in front of the retina. People with myopia typically wear glasses during activities requiring clear distance vision, such as driving or watching movies. Hyperopia, or farsightedness, is the condition where close objects appear blurry. This condition can be caused by insufficient power in the lens or by the eye being too short. People with hyperopia may need glasses for reading or performing tasks at close range. Astigmatism is an irregularity in the curvature of the cornea or lens, causing uneven focus and possibly leading to blurred or distorted vision. Glasses for astigmatism have cylindrical corrections to counteract corneal or lens irregularities. Many people start needing reading glasses around the age of 40 due to presbyopia, which is the loss of the eye's ability to focus on close objects as a result of aging.