Modern definitions simply regard it as an inability to relax accommodation readily.

[2] Accommodative excess may be seen in the following conditions:[3] Use of systemic drugs like Morphine, Digitalis, Sulfonamides, Carbonic anhydrase inhibitors may cause accommodative excess.

[4] Accommodative excess may occur secondary to convergence insufficiency also.

[5] A large amount of near work is the main precipitating factor of accommodative excess.

[7] Parinaud's syndrome, which can mimic some aspects of spasm of the near reflex, such as excessive accommodation and convergence; however, pupillary near-light dissociation, not miosis, is a feature of Parinaud's syndrome.