What's wrong with my eyes not being able to focus?

Nowadays, many people often experience blurred vision. Their eyes cannot focus to see something, and they always squint when looking at something far away. In fact, this situation is a kind of disorder. Most of them are related to the individual's physical constitution. In normal times, we should pay attention to reasonably judge the vision problems and carry out active treatment.

Blurred vision

Vision refers to the ability to distinguish small or distant objects and fine details. A visual acuity below 1.0 is considered impaired vision, and a visual acuity below 0.3 is considered low vision, which manifests as blurred vision.

The lesions that cause blurred vision are located in a wide range of areas, so the causes of blurred vision are also varied.

1. Inflammation is the most common cause of blurred vision.

(1) Infectious: keratitis, corneal ulcer, iridocyclitis, choroiditis, endophthalmitis, panophthalmitis, orbital cellulitis, etc. caused by bacteria, viruses, chlamydia, fungi, parasites, etc.

(2) Non-infectious: bullous stromal keratitis, uveitis (including iridocyclitis and choroiditis), sympathetic ophthalmia, Harada disease, etc.

2. Refractive error

Myopia, hyperopia, astigmatism, presbyopia.

3. Strabismus and amblyopia.

4. Eye injury

Eye perforation, blunt trauma, explosion injury, chemical burns, radiation injury, etc.

5. Glaucoma.

6. Sequelae caused by various eye diseases

Corneal scar, pupil occlusion, pupil closure, vitreous opacities.

7. Systemic circulatory disorders, metabolic disorders and genetic diseases

Hypertensive retinopathy, diabetic retinopathy, nephritic retinopathy, pregnancy-induced hypertension retinopathy, hematologic retinopathy, retinitis pigmentosa, macular degeneration, ischemic optic neuropathy