A smartphone ocular alignment measurement app in school screening for strabismus

BMC Ophthalmology

Table 1 Strabismus Subject Characteristics

Subject	gender	Ethnicity	PACT (△)	EyeTurn (△)	NPC (cm)	Diagnosis
1	male	A/C	10 IXT	3.03	20	IXT, CI
2	male	A/C	14 IXT	4.07	20	IXT, CI
3	male	A/C	10 IXT	3.18	2	IXT
4	female	Caucasian	18 XT	8.97	Constant XT	Congenital 4th nerve palsy with constant XT
5	female	Caucasian	25 ET	20.19	10	Constant ET
6^a	female	Caucasian	14 ET	2.52	6	IET

^aEsotropia case was caught by PACT but missed by the app with 3.0△ as the optimum threshold (evaluated by ROC curve). Of the 6 subjects, 5 were also diagnosed as convergence insufficiency (CI) by near point of convergence (NPC)
A/C Asian/ Caucasian, XT exotropia, ET esotropia.
Strabismus criterion: Manifest strabismus > 8△(recommended by AAPOS) [17].
CI criterion NPC ≥ 6 cm [19].

ISSN: 1471-2415