Optical Lenses and Vision Conditions

The video tutorial on Optometry Online covers refractive errors, including hematropia, ametropia, myopia, hypermetropia, and astigmatism. It explains the optical components of the eye, factors affecting refraction, and symptoms of each condition. The video also discusses various correction methods such as glasses, contact lenses, and surgery.

What is the condition called when the eye is free of refractive errors?

• Astigmatism

• Emmetropia

• Myopia

• Ametropia

Which optical component contributes two-thirds of the eye's optical power?

• Iris

• Retina

• Cornea

• Lens

What happens when the length of the eye is longer than normal?

• Causes myopia

• Causes hypermetropia

• No effect on vision

• Improves vision

What is the main symptom of myopia?

• No vision issues

• Blurred distance vision

• Clear distance vision

• Blurred near vision

Which type of lens is used to correct myopia?

• Cylindrical lens

• Bifocal lens

• Concave lens

• Convex lens

What is hypermetropia also known as?

• Normal vision

• Astigmatism

• Long-sightedness

• Short-sightedness

Which lens type is used to correct hypermetropia?

• Bifocal lens

• Convex lens

• Cylindrical lens

• Concave lens

What causes astigmatism?

• Shorter eye length

• Longer eye length

• Irregular corneal curvature

• Normal corneal curvature

Which lens is used to correct astigmatism?

• Convex lens

• Concave lens

• Cylindrical lens

• Bifocal lens

What is one surgical method to correct refractive errors?

• Corneal transplant

• Retinal surgery

• Cataract surgery

• LASIK surgery