Program for optometry, recording medium and subjective optometric apparatus having the optometric program, and optometric method

An optometric method, comprising the steps of

• measuring an amount of heterophoria of eyes of an examinee to be examined and determining whether esophoria or exophoria exists in a horizontal heterophoria examination;
• calculating a Sheard criterion value based on the measured amount of heterophoria of the eyes of the examinee;
• displaying an operating method to allow the examinee to implement a Sheard criterion identifying examination on a display device by use of the calculated Sheard criterion value;
• allowing the examinee
• to implement a convergent test of the eyes without implementing a divergent test of the eyes in a case where the exophoria exists and to implement a divergent test of the eyes without implementing a convergent test in a case where the esophoria exists based on the operating method, and
• to complete the convergent or divergent test if a fusional convergence or divergence reserve of the eyes satisfies a Sheard criterion based on the Sheard criterion value and to measure the fusional convergence or divergence reserve of the eyes if the fusional convergence or divergence reserve of the eyes does not satisfy the Sheard criterion based on the Sheard criterion value;
• and
• calculating a prism amount for prescriptions based on the heterophoria amount and the fusional convergence reserve of the eyes in the case where the exophoria exists or the fusional divergence reserve of the eyes in the case where the esophoria exists, if the fusional convergence or divergence reserve of the eyes does not satisfy the Sheard criterion.

An optometric apparatus, comprising

• a heterophoria examination device configured to measure an amount of heterophoria of eyes of an examinee to be examined and determine whether exophoria or esophoria exists;
• a display device configured to display an operating method to allow the examinee to implement a Sheard criterion identifying examination;
• a Sheard criterion identifying device configured to calculate a Sheard criterion value from the measured amount of heterophoria of the eyes;
• a divergence or convergence amount examination device configured
• to implement a convergence test of the eyes without implementing a divergent test of the eyes and to implement a divergent test of the eyes without implementing a convergent test in a case where the esophoria exists based on the operating method, and
• to complete the convergence or divergence test if a fusional convergence or divergence reserve of the eyes satisfies a Sheard criterion based on the Sheard criterion value and to measure the fusional convergence or divergence reserve of the eyes if the fusional convergence or divergence reserve does not satisfy the Sheard criterion based on the Sheard criterion value;
• and
• a control device configured to calculate a prism amount for prescriptions based on the heterophoria amount and the fusional convergence reserve of the eye in the case where the exophoria exists or the fusional divergence of the eyes reserve of the eyes in the case where the esophoria exists, if the fusional convergence or divergence reserve of the eyes does not satisfy the Sheard criterion.