WordNet

of or relating to the mental faculties
able to exist under more than one set of conditions; "a facultative parasite can exist as a parasite or a saprophyte"
granting a privilege or permission or power to do or not do something; "a facultative enactment"
not compulsory; "facultative courses in the sciences"

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Shippman S, Weseley AC, Cohen KR.Author information Department of Orthoptics, New York Eye and Ear Infirmary, NY 10003.AbstractThe accommodative convergence/accommodation (AC/A) ratio is thought to be fixed throughout life. We present 11 patients who, in adulthood, show a situational increase in their AC/A ratio. Since all patients had a history of accommodative esotropia with and without a nonaccommodative component, we feel the situational increase in the AC/A ratio is in response to the additional effort needed to correct the patients' facultative hyperopia. These patients demonstrate the importance that all adults with acute onset of commitant esotropia and a history of accommodative esotropia should wear full correction before a prism is incorporated into their glasses or surgical intervention is considered.
Journal of pediatric ophthalmology and strabismus.J Pediatr Ophthalmol Strabismus.1993 Nov-Dec;30(6):368-71.
The accommodative convergence/accommodation (AC/A) ratio is thought to be fixed throughout life. We present 11 patients who, in adulthood, show a situational increase in their AC/A ratio. Since all patients had a history of accommodative esotropia with and without a nonaccommodative component, we fe
PMID 8120741

[The different forms of hypermetropia and the necessity of their precise correction (author's transl)].

Vörösmarthy D.AbstractThe author presents a detailed analysis of hypermetropia. He defines its three pathogenetically important forms:--facultative, relative and absolute, starting from the principles of Donders and based upon the dioptrics of Gullstrand. The author then deals with the pathological processes caused by hypermetropia, especially with the formation of strabismus. Finally he discusses the effects of the three forms of hypermetropia and of the associated other deficiencies of refraction.
Klinische Monatsblätter für Augenheilkunde.Klin Monbl Augenheilkd.1978 Feb;172(2):215-22.
The author presents a detailed analysis of hypermetropia. He defines its three pathogenetically important forms:--facultative, relative and absolute, starting from the principles of Donders and based upon the dioptrics of Gullstrand. The author then deals with the pathological processes caused by hy
PMID 642385

Kettesy A.AbstractDonders created 2 triads in connection with hypermetropia. The first is well known: Ht = Hm + H1. The second is a division into facultative, relative, and absolute hypermetropia. In present ophthalmic literature the second triad is confused with the first; the important member called relative hypermetropia is not even mentioned. I tried to find the cause of this misunderstanding. In my opinion the second triad--in the form Hess had given to it--should be placed among the basic informations of ophthalmology.
Annals of ophthalmology.Ann Ophthalmol.1976 Jun;8(6):653-7.
Donders created 2 triads in connection with hypermetropia. The first is well known: Ht = Hm + H1. The second is a division into facultative, relative, and absolute hypermetropia. In present ophthalmic literature the second triad is confused with the first; the important member called relative hyperm
PMID 937946