<prompt> A girl has pain and blurring of vision while readingAsthenopiaEsotropiaExotropiaEsophoria  <response>: A Asthenopia 341, 346 Khurana 5thAsthenopia aesthenopia from the Greek word asthen-opia : aoGsv-Gma or eye strain is an ophthalmological condition that manifests itself through nonspecific symptoms such as fatigue, pain in or around the eyes, blurred vision, headache and occasionaldouble vision. Symptoms often occur after reading, computer work, or other close activities that involve tedious visual tasks.When concentrating on a visually intense task, such as continuously focusing on a book or computer monitor, the ciliary muscletightens. This can cause the eyes to get irritated and uncomfortable. Giving the eyes a chance to focus on a distant object at least once an hour usually alleviates the problem.Sometimes, asthenopia can be due to specific visual problems, for example, uncorrected refraction errors or binocular vision problems such as accommodative insufficiency orheterophoria. It is often caused by the viewing of monitors such as those of computers or phones.ESOPHORIAEXOPHORIA Common in younger group Increased accommodation Excessive use of convergence may cause esophoriaas occurs in bilateral congenital myopes Dissociation factor such as prolonged constant use of one eye may result in exophoria as occurs in individuals using uniocular microscope and watch makers using uniocular magnifying glass Elderly Decreased accommodation Decreased use of convergence is often associated with exophoria as seen in presbyopesSymptoms1. Muscular fatigue -i Headacheii Difficulty inchanging the focusiii Headache and eyeacheiv Photophobia2. Symptoms of failure to maintain binocular single visioni Blurring or crowding of words while readingii Intermittent diplopia Intermittent squint without diplopia3. Symptoms of defective postural sensation cause problems in judging distances and positions especially of the moving objects. This difficulty may be experienced by cricketers, tennis players and pilots during landing Concomitant convergent squint - Esotropia Concomitant divergent squint - Exotropia Vertical squint - Hypertropia Uncrossed diplopia is seen in convergent squint -Esotropia Crossed diplopia is seen divergent squint -ExotropiaCORTICAL BLINDNESS- Bilateral infarction in the distal posterior cerebral arteries Direct and concensual reflexes are present in both the eyes 