Hyperopia Treatment Study 1 (HTS1) - Glasses vs Observation

Moderate and high hyperopia are associated with the development of strabismus and amblyopia.
The primary aims of treatment for asymptomatic moderate and high hyperopia in preschool
children are to facilitate the development of normal visual acuity and to prevent the
development of esotropia and amblyopia. Treatment consists of optical correction, typically
using glasses. For children with high hyperopia (>+5.00D) and without strabismus or
amblyopia, there is general consensus that a correction should be prescribed. Nevertheless,
for children with moderate hyperopia (+3.00D to +5.00D) without strabismus or amblyopia,
there is less consensus among pediatric eye care professionals. A survey by Lyons et al found
that for a 2-year-old child with hyperopia greater than +3.00D, 65% of optometrists would
prescribe glasses compared to 25% of ophthalmologists; for a 4-year old with hyperopia
greater than +3.00D, 67% of optometrists would prescribe compared with 42% of
ophthalmologists. The American Association for Pediatric Ophthalmology and Strabismus (AAPOS)
recommends correcting +4.00D or more in 2 to 7 year olds and the American Academy of
Ophthalmology recommends a threshold of +4.50D for correction in 2-to 3-year olds. Unlike
ophthalmology, optometry does not provide specific recommendations based on age and level of
refractive error. Such variation in practice highlights the lack of rigorously collected
scientific evidence for the management of this condition. Across all levels of hyperopia,
most ophthalmologists and optometrists usually prescribe less than the full cycloplegic
refraction (71% in the Lyons survey) when no strabismus or amblyopia is present.

The rationale for proactively correcting moderate hyperopia in an asymptomatic child is the
prevention of esotropia, amblyopia, or asthenopia. The argument against correcting moderate
hyperopia in an asymptomatic child is the expense and inconvenience of glasses that might be
unnecessary and the potential disruption of emmetropization in infants and toddlers. At
present, it remains uncertain whether correction of moderate hyperopia is beneficial in terms
of visual acuity outcomes or strabismus development. There is some evidence that using
partial correction of hyperopia allows emmetropization to take place.

If refractive correction of moderate hyperopia does not reduce the incidence of amblyopia
and/or esotropia compared to no refractive correction, then glasses can be avoided. However,
if correcting moderate hyperopia does reduce the development of amblyopia and/or esotropia,
then the benefits of preemptive refractive correction will have been identified.

Inclusion Criteria:

1. Age 12 to < 72 months

2. Refractive error between +3.00D and +6.00D SE (by cycloplegic refraction) in either
eye

3. Astigmatism < 1.50D in both eyes

4. Spherical equivalent anisometropia ≤ +1.50D

5. For children 36 to <72 months of age:

1. No evidence of subnormal visual acuity - Uncorrected monocular visual acuity in
both eyes of 20/50 or better for age 36 to <48 months,20/40 or better for age 48
to <60 months, and 20/32 or better for ages 60 to <72 months measured without
cycloplegia using the ATS-HOTV© visual acuity testing protocol

2. Zero (0) or 1 logMAR line interocular difference (IOD) in uncorrected visual
acuity measured without cycloplegia using the ATS-HOTV© visual acuity testing
protocol

3. Age-normal stereoacuity on the Randot Preschool Stereotest (see Table 2 of
protocol)

6. Gestational age >32 weeks

7. Investigator is willing to prescribe glasses per protocol or observe the hyperopia
untreated for 3 years unless specific criteria for deterioration outlined in section
3.3.3 are confirmed.

8. Parent understands the protocol and is willing to accept randomization to either
glasses or no glasses initially, and is willing to wear glasses as prescribed or
accept that glasses will not be prescribed by the investigator unless specific
deterioration criteria outlined in section 3.3.3 are confirmed.

9. Parent has phone (or access to phone) and is willing to be contacted by Jaeb Center
staff.

10. Relocation outside of area of an active PEDIG site for this study within the next 36
months is not anticipated.

Exclusion Criteria:

A patient is excluded for any of the following reasons:

1. Any measurable heterotropia at distance (3 meters) or at near (1/3 meter) by
cover/uncover testing. Note that patients with heterophoria are eligible.

2. Previous documented strabismus (parental report must be confirmed by investigator)

3. Manifest or latent nystagmus evident clinically

4. Previous treatment of refractive error with glasses or contacts unless duration of
glasses or contacts wear was one week or less and occurred more than 2 months prior to
enrollment.

5. Previous intraocular, refractive, or extraocular muscle surgery

6. Previous amblyopia treatment

7. Previous vergence/accommodative therapy

8. Parental concerns over learning or development

9. Ocular co-morbidity that may reduce visual acuity

10. Symptoms of blur or asthenopia

11. Developmental delay diagnosed by pediatrician or Individualized Education Program
(IEP)

12. Known neurological anomalies (e.g. cerebral palsy, Down syndrome)

13. Inability to perform visual acuity ATS-HOTV testing if ≥ 36 months of age