Clinical

Binocular Vision

Assessing fusional reserves at near

Assessing horizontal fusional reserves at near gives you the measure of your patient’s stamina, or ‘petrol in the tank’ to be able to manage their phoria, or ‘posture’.

Prescribing adds for accommodation lag

Given that a normal lag result is +0.50, I would generally prescribe an add which is the accommodative lag result subtracting 0.50, so the resulting final lag is within the normal range. For example, a lag of +2.00 results in a +1.50 Add; a lag of +1.50 results in a +1.00 Add. However, this formula may not work if:

Measuring accommodative facility

Assessing accommodative function at near is a vital component of understanding the myopia profile of your patient. Myopic progression in children and adults can be influenced by binocular vision function.