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2018 ; 11
(3
): 153-159
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Measuring the heterophoria: Agreement between two methods in non-presbyopic and
presbyopic patients
#MMPMID29198488
Cantó-Cerdán M
; Cacho-Martínez P
; García-Muñoz Á
J Optom
2018[Jul]; 11
(3
): 153-159
PMID29198488
show ga
PURPOSE: To establish whether the cover test and von Graefe methods are
interchangeable in a non-presbyopic and presbyopic population. METHODS: We
performed a prospective study on a sample of 127 non-presbyopic subjects between
20 and 45 years old and 56 presbyopic between 40 and 78 years old. Distance and
near vision phoria were measured using the von Graefe method (VG) and cover test
(CT). We analyzed the significant differences between methods, their correlation
and the agreement between them using the Bland and Altman method. RESULTS: For
distance vision, heterophoria values for non-presbyopic subjects were -0.61±1.86?
with CT and -0.88±2.37? with VG, and for presbyopic subjects were -0.56±1.64?
with CT and -0.85±1.94? with VG. For near vision, CT yielded -3.02±3.97?, while
VG achieved -3.49±4.70? in non-presbyopic subjects. For presbyopic subjects these
values were -6.05±4.38? with CT and -6.29±4.19? with VG, respectively.
Statistically significant differences between the two methods were observed for
all groups analyzed (p<0.05), except for near vision in presbyopic subjects
(p>0.05). Coefficient of agreement for non-presbyopic was ±2.97? for distance
vision and ±6.74? at near. For presbyopic patients, this coefficient was ±1.59?
for distance and ±1.86? for near vision. CONCLUSION: Cover test and von Graefe
methods have a high level of agreement for both distance and near vision when
considering presbyopic subjects. For non-presbyopic patients, the level of
agreement is very low. Both methods for measuring heterophoria can only be
considered interchangeable for presbyopic patients. For clinical purposes, this
implies that any method can be used for measuring heterophoria in presbyopic
patients.