Symptoms:

• Blurred vision or squinting when trying to see distant objects (children often cannot read the blackboard, but can easily read a book)
• Eyestrain
• Headaches (uncommon)

Signs and tests:

A general eye examination, or standard ophthalmic exam may include:

• Measurement of the pressure of fluid in the eyes
• Refraction test, to determine the correct prescription for glasses
• Retinal examination
• Slit-lamp exam of the structures at the front of the eyes
• Test of color vision, to look for possible color blindness
• Tests of the muscles that move the eyes
• Visual acuity, both at a distance (Snellen), and close up (Jaeger)