1. Nearsightedness(myopia)-is a condition where objects up close appear clearly, while objects far away appear blurry. Myopia is a risk factor for retinal detachment.
1.1. Farsightedness(hyperopia) is a common type of refractive error where distant objects may be seen clearly than objects that are near.
1.1.1. Astigmatism is a condition in which the eye does not focus light evenly onto the retina, the light-sensitive tissue at the back of the eye.
1.1.1.1. Presbyopia is an age-related condition in which the ability to focus up close becomes more difficult.
1.1.1.1.1. Blurred vision is the most common symptom of refractive errors.
2. Cataract is a clouding of the eye’s lens and is the leading cause of blindness worldwide, and the leading cause of vision loss.
2.1. Diabetic retinopathy (DR) is a common complication of diabetes. It is the leading cause of blindness in adults. It is characterized by progressive damage to the blood vessels of the retina, the light-sensitive tissue at the back of the eye that is necessary for good vision.
2.1.1. Glaucoma is a group of diseases that can damage the eye’s optic nerve and result in vision loss and blindness. Glaucoma occurs when the normal fluid pressure inside the eyes slowly rises.
2.1.1.1. Strabismus involves an imbalance in the positioning of the two eyes. Strabismus can cause the eyes to cross in (esotropia) or turn out (exotropia). Strabismus is caused by a lack of coordination between the eyes. As a result, the eyes look in different directions and do not focus simultaneously on a single point.