Functional hyperopia: refers to a part of hyperopia that can be neutralized by self-adjustment.
Absolute hyperopia: refers to the part of hyperopia that cannot be neutralized after calling all self-adjustment.
Functional hyperopia + absolute hyperopia = total hyperopia
No.1 When the patient is very young and the adjustment range is greater than the total hyperopia, the patient can use the self-adjustment to neutralize all hyperopia, so the total hyperopia is equal to the functional hyperopia, and the absolute hyperopia is zero.
No.2 When the patient has no adjustment power at all (such as the elderly), the total hyperopia is the absolute hyperopia, and the functional hyperopia is zero.
No.3 As the patient ages, the accommodative amplitude gradually decreases, and the relationship between functional hyperopia and absolute hyperopia is constantly changing. (For example: total hyperopia = 4.00D, patient accommodative amplitude = 10D)
No.4 Accommodative amplitude > total hyperopia, so total hyperopia can be functional hyperopia, and the patient's distance vision without correction is 1.0.
No.5 As the patient ages, the accommodative amplitude decreases, and his functional hyperopia will decrease while his absolute hyperopia will increase.
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Post time: Jun-28-2024